2 Advanced Linux Sound Architecture - Driver
3 ==========================================
10 To enable ALSA support you need at least to build the kernel with
11 primary sound card support (CONFIG_SOUND). Since ALSA can emulate OSS,
12 you don't have to choose any of the OSS modules.
14 Enable "OSS API emulation" (CONFIG_SND_OSSEMUL) and both OSS mixer and
15 PCM supports if you want to run OSS applications with ALSA.
17 If you want to support the WaveTable functionality on cards such as
18 SB Live! then you need to enable "Sequencer support"
19 (CONFIG_SND_SEQUENCER).
21 To make ALSA debug messages more verbose, enable the "Verbose printk"
22 and "Debug" options. To check for memory leaks, turn on "Debug memory"
23 too. "Debug detection" will add checks for the detection of cards.
25 Please note that all the ALSA ISA drivers support the Linux isapnp API
26 (if the card supports ISA PnP). You don't need to configure the cards
33 This depends on your distribution, but normally you use the /dev/MAKEDEV
34 script to create the necessary device nodes. On some systems you use a
35 script named 'snddevices'.
41 The user can load modules with options. If the module supports more than
42 one card and you have more than one card of the same type then you can
43 specify multiple values for the option separated by commas.
45 Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
50 The core ALSA module. It is used by all ALSA card drivers.
51 It takes the following options which have global effects.
53 major - major number for sound driver
56 - limiting card index for auto-loading (1-8)
58 - For auto-loading more than one card, specify this
59 option together with snd-card-X aliases.
60 slots - Reserve the slot index for the given driver.
61 This option takes multiple strings.
62 See "Module Autoloading Support" section for details.
67 The PCM OSS emulation module.
68 This module takes options which change the mapping of devices.
70 dsp_map - PCM device number maps assigned to the 1st OSS device.
72 adsp_map - PCM device number maps assigned to the 2st OSS device.
75 - Don't block opening busy PCM devices. Default: 1
77 For example, when dsp_map=2, /dev/dsp will be mapped to PCM #2 of
78 the card #0. Similarly, when adsp_map=0, /dev/adsp will be mapped
79 to PCM #0 of the card #0.
80 For changing the second or later card, specify the option with
81 commas, such like "dsp_map=0,1".
83 nonblock_open option is used to change the behavior of the PCM
84 regarding opening the device. When this option is non-zero,
85 opening a busy OSS PCM device won't be blocked but return
86 immediately with EAGAIN (just like O_NONBLOCK flag).
91 This module takes options which change the mapping of devices.
92 similar to those of the snd-pcm-oss module.
94 midi_map - MIDI device number maps assigned to the 1st OSS device.
96 amidi_map - MIDI device number maps assigned to the 2st OSS device.
99 Common parameters for top sound card modules
100 --------------------------------------------
102 Each of top level sound card module takes the following options.
104 index - index (slot #) of sound card
105 - Values: 0 through 31 or negative
106 - If nonnegative, assign that index number
107 - if negative, interpret as a bitmask of permissible
108 indices; the first free permitted index is assigned
110 id - card ID (identifier or name)
111 - Can be up to 15 characters long
112 - Default: the card type
113 - A directory by this name is created under /proc/asound/
114 containing information about the card
115 - This ID can be used instead of the index number in
118 - Default: enabled, for PCI and ISA PnP cards
123 Module for AdLib FM cards.
125 port - port # for OPL chip
127 This module supports multiple cards. It does not support autoprobe, so
128 the port must be specified. For actual AdLib FM cards it will be 0x388.
129 Note that this card does not have PCM support and no mixer; only FM
132 Make sure you have "sbiload" from the alsa-tools package available and,
133 after loading the module, find out the assigned ALSA sequencer port
134 number through "sbiload -l". Example output:
136 Port Client name Port name
137 64:0 OPL2 FM synth OPL2 FM Port
139 Load the std.sb and drums.sb patches also supplied by sbiload:
141 sbiload -p 64:0 std.sb drums.sb
143 If you use this driver to drive an OPL3, you can use std.o3 and drums.o3
144 instead. To have the card produce sound, use aplaymidi from alsa-utils:
146 aplaymidi -p 64:0 foo.mid
151 Module for sound cards based on Analog Devices AD1816A/AD1815 ISA chips.
153 clockfreq - Clock frequency for AD1816A chip (default = 0, 33000Hz)
155 This module supports multiple cards, autoprobe and PnP.
160 Module for sound cards based on AD1848/AD1847/CS4248 ISA chips.
162 port - port # for AD1848 chip
163 irq - IRQ # for AD1848 chip
164 dma1 - DMA # for AD1848 chip (0,1,3)
166 This module supports multiple cards. It does not support autoprobe
167 thus main port must be specified!!! Other ports are optional.
169 The power-management is supported.
174 Module for Analog Devices AD1889 chips.
176 ac97_quirk - AC'97 workaround for strange hardware
177 See the description of intel8x0 module for details.
179 This module supports multiple cards.
184 Module for ALi M5451 PCI chip.
186 pcm_channels - Number of hardware channels assigned for PCM
187 spdif - Support SPDIF I/O
190 This module supports one chip and autoprobe.
192 The power-management is supported.
197 Module for sound cards based on Avance Logic ALS100/ALS120 ISA chips.
199 This module supports multiple cards, autoprobe and PnP.
201 The power-management is supported.
206 Module for Avance Logic ALS300 and ALS300+
208 This module supports multiple cards.
210 The power-management is supported.
215 Module for sound cards based on Avance Logic ALS4000 PCI chip.
217 joystick_port - port # for legacy joystick support.
218 0 = disabled (default), 1 = auto-detect
220 This module supports multiple cards, autoprobe and PnP.
222 The power-management is supported.
227 Module for ATI IXP 150/200/250/400 AC97 controllers.
229 ac97_clock - AC'97 clock (default = 48000)
230 ac97_quirk - AC'97 workaround for strange hardware
231 See "AC97 Quirk Option" section below.
232 ac97_codec - Workaround to specify which AC'97 codec
233 instead of probing. If this works for you
234 file a bug with your `lspci -vn` output.
236 -1 -- Default behavior.
237 0-2 -- Use the specified codec.
238 spdif_aclink - S/PDIF transfer over AC-link (default = 1)
240 This module supports one card and autoprobe.
242 ATI IXP has two different methods to control SPDIF output. One is
243 over AC-link and another is over the "direct" SPDIF output. The
244 implementation depends on the motherboard, and you'll need to
245 choose the correct one via spdif_aclink module option.
247 The power-management is supported.
249 Module snd-atiixp-modem
250 -----------------------
252 Module for ATI IXP 150/200/250 AC97 modem controllers.
254 This module supports one card and autoprobe.
256 Note: The default index value of this module is -2, i.e. the first
259 The power-management is supported.
261 Module snd-au8810, snd-au8820, snd-au8830
262 -----------------------------------------
264 Module for Aureal Vortex, Vortex2 and Advantage device.
266 pcifix - Control PCI workarounds
267 0 = Disable all workarounds
268 1 = Force the PCI latency of the Aureal card to 0xff
269 2 = Force the Extend PCI#2 Internal Master for Efficient
270 Handling of Dummy Requests on the VIA KT133 AGP Bridge
271 3 = Force both settings
272 255 = Autodetect what is required (default)
274 This module supports all ADB PCM channels, ac97 mixer, SPDIF, hardware
275 EQ, mpu401, gameport. A3D and wavetable support are still in development.
276 Development and reverse engineering work is being coordinated at
277 http://savannah.nongnu.org/projects/openvortex/
278 SPDIF output has a copy of the AC97 codec output, unless you use the
279 "spdif" pcm device, which allows raw data passthru.
280 The hardware EQ hardware and SPDIF is only present in the Vortex2 and
283 Note: Some ALSA mixer applications don't handle the SPDIF sample rate
284 control correctly. If you have problems regarding this, try
285 another ALSA compliant mixer (alsamixer works).
290 Module for sound cards based on Aztech System AZT2320 ISA chip (PnP only).
292 This module supports multiple cards, PnP and autoprobe.
294 The power-management is supported.
299 Module for sound cards based on Aztech AZF3328 PCI chip.
301 joystick - Enable joystick (default off)
303 This module supports multiple cards.
308 Module for video cards based on Bt87x chips.
310 digital_rate - Override the default digital rate (Hz)
311 load_all - Load the driver even if the card model isn't known
313 This module supports multiple cards.
315 Note: The default index value of this module is -2, i.e. the first
321 Module for Creative Audigy LS and SB Live 24bit
323 This module supports multiple cards.
329 Module for sound cards based on C-Media CMI8330 ISA chips.
331 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
333 with isapnp=0, the following options are available:
335 wssport - port # for CMI8330 chip (WSS)
336 wssirq - IRQ # for CMI8330 chip (WSS)
337 wssdma - first DMA # for CMI8330 chip (WSS)
338 sbport - port # for CMI8330 chip (SB16)
339 sbirq - IRQ # for CMI8330 chip (SB16)
340 sbdma8 - 8bit DMA # for CMI8330 chip (SB16)
341 sbdma16 - 16bit DMA # for CMI8330 chip (SB16)
343 This module supports multiple cards and autoprobe.
345 The power-management is supported.
350 Module for C-Media CMI8338/8738/8768/8770 PCI sound cards.
352 mpu_port - port address of MIDI interface (8338 only):
353 0x300,0x310,0x320,0x330 = legacy port,
354 0 = disable (default)
355 fm_port - port address of OPL-3 FM synthesizer (8x38 only):
357 1 = integrated PCI port (default on 8738),
359 soft_ac3 - Software-conversion of raw SPDIF packets (model 033 only)
361 joystick_port - Joystick port address (0 = disable, 1 = auto-detect)
363 This module supports autoprobe and multiple cards.
365 The power-management is supported.
370 Module for sound cards based on CS4231 ISA chips.
372 port - port # for CS4231 chip
373 mpu_port - port # for MPU-401 UART (optional), -1 = disable
374 irq - IRQ # for CS4231 chip
375 mpu_irq - IRQ # for MPU-401 UART
376 dma1 - first DMA # for CS4231 chip
377 dma2 - second DMA # for CS4231 chip
379 This module supports multiple cards. This module does not support autoprobe
380 thus main port must be specified!!! Other ports are optional.
382 The power-management is supported.
387 Module for sound cards based on CS4232/CS4232A ISA chips.
389 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
391 with isapnp=0, the following options are available:
393 port - port # for CS4232 chip (PnP setup - 0x534)
394 cport - control port # for CS4232 chip (PnP setup - 0x120,0x210,0xf00)
395 mpu_port - port # for MPU-401 UART (PnP setup - 0x300), -1 = disable
396 fm_port - FM port # for CS4232 chip (PnP setup - 0x388), -1 = disable
397 irq - IRQ # for CS4232 chip (5,7,9,11,12,15)
398 mpu_irq - IRQ # for MPU-401 UART (9,11,12,15)
399 dma1 - first DMA # for CS4232 chip (0,1,3)
400 dma2 - second DMA # for Yamaha CS4232 chip (0,1,3), -1 = disable
402 This module supports multiple cards. This module does not support autoprobe
403 (if ISA PnP is not used) thus main port must be specified!!! Other ports are
406 The power-management is supported.
411 Module for sound cards based on CS4235/CS4236/CS4236B/CS4237B/
412 CS4238B/CS4239 ISA chips.
414 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
416 with isapnp=0, the following options are available:
418 port - port # for CS4236 chip (PnP setup - 0x534)
419 cport - control port # for CS4236 chip (PnP setup - 0x120,0x210,0xf00)
420 mpu_port - port # for MPU-401 UART (PnP setup - 0x300), -1 = disable
421 fm_port - FM port # for CS4236 chip (PnP setup - 0x388), -1 = disable
422 irq - IRQ # for CS4236 chip (5,7,9,11,12,15)
423 mpu_irq - IRQ # for MPU-401 UART (9,11,12,15)
424 dma1 - first DMA # for CS4236 chip (0,1,3)
425 dma2 - second DMA # for CS4236 chip (0,1,3), -1 = disable
427 This module supports multiple cards. This module does not support autoprobe
428 (if ISA PnP is not used) thus main port and control port must be
429 specified!!! Other ports are optional.
431 The power-management is supported.
436 Module for Cirrus Logic CS4281 soundchip.
438 dual_codec - Secondary codec ID (0 = disable, default)
440 This module supports multiple cards.
442 The power-management is supported.
447 Module for PCI sound cards based on CS4610/CS4612/CS4614/CS4615/CS4622/
448 CS4624/CS4630/CS4280 PCI chips.
450 external_amp - Force to enable external amplifier.
451 thinkpad - Force to enable Thinkpad's CLKRUN control.
452 mmap_valid - Support OSS mmap mode (default = 0).
454 This module supports multiple cards and autoprobe.
455 Usually external amp and CLKRUN controls are detected automatically
456 from PCI sub vendor/device ids. If they don't work, give the options
459 The power-management is supported.
464 Module for Cyrix/NatSemi Geode 5530 chip.
466 Module snd-cs5535audio
467 ----------------------
469 Module for multifunction CS5535 companion PCI device
471 The power-management is supported.
476 Module for Echoaudio Darla20
478 This module supports multiple cards.
479 The driver requires the firmware loader support on kernel.
484 Module for Echoaudio Darla24
486 This module supports multiple cards.
487 The driver requires the firmware loader support on kernel.
492 Module for Diamond Technologies DT-019X / Avance Logic ALS-007 (PnP
495 This module supports multiple cards. This module is enabled only with
498 The power-management is supported.
503 Module for the dummy sound card. This "card" doesn't do any output
504 or input, but you may use this module for any application which
505 requires a sound card (like RealPlayer).
507 The power-management is supported.
512 Module for Echoaudio 3G cards (Gina3G/Layla3G)
514 This module supports multiple cards.
515 The driver requires the firmware loader support on kernel.
520 Module for EMU10K1/EMU10k2 based PCI sound cards.
521 * Sound Blaster Live!
522 * Sound Blaster PCI 512
523 * Emu APS (partially supported)
524 * Sound Blaster Audigy
526 extin - bitmap of available external inputs for FX8010 (see bellow)
527 extout - bitmap of available external outputs for FX8010 (see bellow)
528 seq_ports - allocated sequencer ports (4 by default)
529 max_synth_voices - limit of voices used for wavetable (64 by default)
530 max_buffer_size - specifies the maximum size of wavetable/pcm buffers
531 given in MB unit. Default value is 128.
532 enable_ir - enable IR
534 This module supports multiple cards and autoprobe.
536 Input & Output configurations [extin/extout]
537 * Creative Card wo/Digital out [0x0003/0x1f03]
538 * Creative Card w/Digital out [0x0003/0x1f0f]
539 * Creative Card w/Digital CD in [0x000f/0x1f0f]
540 * Creative Card wo/Digital out + LiveDrive [0x3fc3/0x1fc3]
541 * Creative Card w/Digital out + LiveDrive [0x3fc3/0x1fcf]
542 * Creative Card w/Digital CD in + LiveDrive [0x3fcf/0x1fcf]
543 * Creative Card wo/Digital out + Digital I/O 2 [0x0fc3/0x1f0f]
544 * Creative Card w/Digital out + Digital I/O 2 [0x0fc3/0x1f0f]
545 * Creative Card w/Digital CD in + Digital I/O 2 [0x0fcf/0x1f0f]
546 * Creative Card 5.1/w Digital out + LiveDrive [0x3fc3/0x1fff]
547 * Creative Card 5.1 (c) 2003 [0x3fc3/0x7cff]
548 * Creative Card all ins and outs [0x3fff/0x7fff]
550 The power-management is supported.
555 Module for Creative Emu10k1X (SB Live Dell OEM version)
557 This module supports multiple cards.
562 Module for Ensoniq AudioPCI ES1370 PCI sound cards.
563 * SoundBlaster PCI 64
564 * SoundBlaster PCI 128
566 joystick - Enable joystick (default off)
568 This module supports multiple cards and autoprobe.
570 The power-management is supported.
575 Module for Ensoniq AudioPCI ES1371 PCI sound cards.
576 * SoundBlaster PCI 64
577 * SoundBlaster PCI 128
578 * SoundBlaster Vibra PCI
580 joystick_port - port # for joystick (0x200,0x208,0x210,0x218),
581 0 = disable (default), 1 = auto-detect
583 This module supports multiple cards and autoprobe.
585 The power-management is supported.
590 Module for sound cards based on ESS ES968 chip (PnP only).
592 This module supports multiple cards, PnP and autoprobe.
594 The power-management is supported.
599 Module for ESS AudioDrive ES-1688 and ES-688 sound cards.
601 port - port # for ES-1688 chip (0x220,0x240,0x260)
602 mpu_port - port # for MPU-401 port (0x300,0x310,0x320,0x330), -1 = disable (default)
603 irq - IRQ # for ES-1688 chip (5,7,9,10)
604 mpu_irq - IRQ # for MPU-401 port (5,7,9,10)
605 dma8 - DMA # for ES-1688 chip (0,1,3)
607 This module supports multiple cards and autoprobe (without MPU-401 port).
612 Module for ESS AudioDrive ES-18xx sound cards.
614 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
616 with isapnp=0, the following options are available:
618 port - port # for ES-18xx chip (0x220,0x240,0x260)
619 mpu_port - port # for MPU-401 port (0x300,0x310,0x320,0x330), -1 = disable (default)
620 fm_port - port # for FM (optional, not used)
621 irq - IRQ # for ES-18xx chip (5,7,9,10)
622 dma1 - first DMA # for ES-18xx chip (0,1,3)
623 dma2 - first DMA # for ES-18xx chip (0,1,3)
625 This module supports multiple cards, ISA PnP and autoprobe (without MPU-401
626 port if native ISA PnP routines are not used).
627 When dma2 is equal with dma1, the driver works as half-duplex.
629 The power-management is supported.
634 Module for sound cards based on ESS Solo-1 (ES1938,ES1946) chips.
636 This module supports multiple cards and autoprobe.
638 The power-management is supported.
643 Module for sound cards based on ESS Maestro-1/2/2E (ES1968/ES1978) chips.
645 total_bufsize - total buffer size in kB (1-4096kB)
646 pcm_substreams_p - playback channels (1-8, default=2)
647 pcm_substreams_c - capture channels (1-8, default=0)
648 clock - clock (0 = auto-detection)
649 use_pm - support the power-management (0 = off, 1 = on,
651 enable_mpu - enable MPU401 (0 = off, 1 = on, 2 = auto (default))
652 joystick - enable joystick (default off)
654 This module supports multiple cards and autoprobe.
656 The power-management is supported.
661 Module for ForteMedia FM801 based PCI sound cards.
663 tea575x_tuner - Enable TEA575x tuner
664 - 1 = MediaForte 256-PCS
665 - 2 = MediaForte 256-PCPR
666 - 3 = MediaForte 64-PCR
667 - High 16-bits are video (radio) device number + 1
668 - example: 0x10002 (MediaForte 256-PCPR, device 1)
670 This module supports multiple cards and autoprobe.
672 The power-management is supported.
677 Module for Echoaudio Gina20
679 This module supports multiple cards.
680 The driver requires the firmware loader support on kernel.
685 Module for Echoaudio Gina24
687 This module supports multiple cards.
688 The driver requires the firmware loader support on kernel.
690 Module snd-gusclassic
691 ---------------------
693 Module for Gravis UltraSound Classic sound card.
695 port - port # for GF1 chip (0x220,0x230,0x240,0x250,0x260)
696 irq - IRQ # for GF1 chip (3,5,9,11,12,15)
697 dma1 - DMA # for GF1 chip (1,3,5,6,7)
698 dma2 - DMA # for GF1 chip (1,3,5,6,7,-1=disable)
699 joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V)
700 voices - GF1 voices limit (14-32)
701 pcm_voices - reserved PCM voices
703 This module supports multiple cards and autoprobe.
705 Module snd-gusextreme
706 ---------------------
708 Module for Gravis UltraSound Extreme (Synergy ViperMax) sound card.
710 port - port # for ES-1688 chip (0x220,0x230,0x240,0x250,0x260)
711 gf1_port - port # for GF1 chip (0x210,0x220,0x230,0x240,0x250,0x260,0x270)
712 mpu_port - port # for MPU-401 port (0x300,0x310,0x320,0x330), -1 = disable
713 irq - IRQ # for ES-1688 chip (5,7,9,10)
714 gf1_irq - IRQ # for GF1 chip (3,5,9,11,12,15)
715 mpu_irq - IRQ # for MPU-401 port (5,7,9,10)
716 dma8 - DMA # for ES-1688 chip (0,1,3)
717 dma1 - DMA # for GF1 chip (1,3,5,6,7)
718 joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V)
719 voices - GF1 voices limit (14-32)
720 pcm_voices - reserved PCM voices
722 This module supports multiple cards and autoprobe (without MPU-401 port).
727 Module for Gravis UltraSound MAX sound card.
729 port - port # for GF1 chip (0x220,0x230,0x240,0x250,0x260)
730 irq - IRQ # for GF1 chip (3,5,9,11,12,15)
731 dma1 - DMA # for GF1 chip (1,3,5,6,7)
732 dma2 - DMA # for GF1 chip (1,3,5,6,7,-1=disable)
733 joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V)
734 voices - GF1 voices limit (14-32)
735 pcm_voices - reserved PCM voices
737 This module supports multiple cards and autoprobe.
742 Module for Intel HD Audio (ICH6, ICH6M, ESB2, ICH7, ICH8),
743 ATI SB450, SB600, RS600,
747 model - force the model name
748 position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
749 probe_mask - Bitmask to probe codecs (default = -1, meaning all slots)
750 single_cmd - Use single immediate commands to communicate with
751 codecs (for debugging only)
752 enable_msi - Enable Message Signaled Interrupt (MSI) (default = off)
753 power_save - Automatic power-saving timtout (in second, 0 =
755 power_save_controller - Reset HD-audio controller in power-saving mode
758 This module supports one card and autoprobe.
760 Each codec may have a model table for different configurations.
761 If your machine isn't listed there, the default (usually minimal)
762 configuration is set up. You can pass "model=<name>" option to
763 specify a certain model in such a case. There are different
764 models depending on the codec chip.
766 Model name Description
767 ---------- -----------
769 3stack 3-jack in back and a headphone out
770 3stack-digout 3-jack in back, a HP out and a SPDIF out
771 5stack 5-jack in back, 2-jack in front
772 5stack-digout 5-jack in back, 2-jack in front, a SPDIF out
773 6stack 6-jack in back, 2-jack in front
774 6stack-digout 6-jack with a SPDIF out
776 z71v 3-jack (HP shared SPDIF)
777 asus 3-jack (ASUS Mobo)
779 asus-dig ASUS with SPDIF out
780 asus-dig2 ASUS with SPDIF out (using GPIO2)
782 fujitsu Fujitsu Laptops (Pi1536)
784 lg LG laptop (m1 express dual)
785 lg-lw LG LW20/LW25 laptop
787 clevo Clevo laptops (m520G, m665n)
788 test for testing/debugging purpose, almost all controls can be
789 adjusted. Appearing only when compiled with
791 auto auto-config reading BIOS (default)
795 hp-3013 HP machines (3013-variant)
796 fujitsu Fujitsu S7020
798 will Will laptops (PB V7900)
799 replacer Replacer 672V
800 basic fixed pin assignment (old default model)
801 auto auto-config reading BIOS (default)
804 fujitsu Fujitsu Laptop
805 hp-bpc HP xw4400/6400/8400/9400 laptops
806 hp-bpc-d7000 HP BPC D7000
807 hp-tc-t5735 HP Thin Client T5735
810 hippo Hippo (ATI) with jack detection, Sony UX-90s
811 hippo_1 Hippo (Benq) with jack detection
812 sony-assamd Sony ASSAMD
813 ultra Samsung Q1 Ultra Vista model
814 basic fixed pin assignment w/o SPDIF
815 auto auto-config reading BIOS (default)
821 auto auto-config reading BIOS (default)
824 3stack-dig 3-stack (2-channel) with SPDIF
825 3stack-6ch 3-stack (6-channel)
826 3stack-6ch-dig 3-stack (6-channel) with SPDIF
827 6stack-dig 6-stack with SPDIF
828 lenovo-101e Lenovo laptop
829 eeepc-p701 ASUS Eeepc
830 auto auto-config reading BIOS (default)
833 3stack-dig 3-jack with SPDIF I/O
834 6stack-dig 6-jack digital with SPDIF I/O
836 targa Targa T8, MSI-1049 T8
839 macpro MacPro support
840 mbp3 Macbook Pro rev3
841 imac24 iMac 24'' with jack detection
843 auto auto-config reading BIOS (default)
846 3stack-dig 3-jack with SPDIF I/O
847 6stack-dig 6-jack digital with SPDIF I/O
848 3stack-6ch 3-jack 6-channel
849 3stack-6ch-dig 3-jack 6-channel with SPDIF I/O
850 6stack-dig-demo 6-jack digital for Intel demo board
851 acer Acer laptops (Travelmate 3012WTMi, Aspire 5600, etc)
852 acer-aspire Acer Aspire 9810
853 medion Medion Laptops
854 medion-md2 Medion MD2
856 targa-2ch-dig Targs/MSI with 2-channel
857 laptop-eapd 3-jack with SPDIF I/O and EAPD (Clevo M540JE, M550JE)
858 lenovo-101e Lenovo 101E
859 lenovo-nb0763 Lenovo NB0763
860 lenovo-ms7195-dig Lenovo MS7195
862 6stack-hp HP machines with 6stack (Nettle boards)
863 3stack-hp HP machines with 3stack (Lucknow, Samba boards)
865 auto auto-config reading BIOS (default)
869 3stack-dig 3-jack with SPDIF I/O
870 6stack-dig 6-jack with SPDIF I/O
871 3stack-660 3-jack (for ALC660)
872 uniwill-m31 Uniwill M31 laptop
873 toshiba Toshiba laptop support
874 asus Asus laptop support
875 asus-laptop ASUS F2/F3 laptops
876 auto auto-config reading BIOS (default)
880 3stack-dig 3-jack with SPDIF OUT
881 6stack-dig 6-jack with SPDIF OUT
882 3stack-660 3-jack (for ALC660VD)
883 3stack-660-digout 3-jack with SPDIF OUT (for ALC660VD)
884 lenovo Lenovo 3000 C200
885 dallas Dallas laptops
887 auto auto-config reading BIOS (default)
890 minimal 3-jack in back
891 min_fp 3-jack in back, 2-jack in front
892 full 6-jack in back, 2-jack in front
893 full_dig 6-jack in back, 2-jack in front, SPDIF I/O
894 allout 5-jack in back, 2-jack in front, SPDIF out
895 auto auto-config reading BIOS (default)
898 3stack 3-stack mode (default)
905 basic 3-jack (default)
907 thinkpad Lenovo Thinkpad T60/X60/Z60
914 basic default configuration
915 thinkpad Lenovo Thinkpad T61/X61
918 6stack 6-jack, separate surrounds (default)
919 3stack 3-stack, shared surrounds
920 laptop 2-channel only (FSC V2060, Samsung M50)
921 laptop-eapd 2-channel with EAPD (Samsung R65, ASUS A6J)
922 laptop-automute 2-channel with EAPD and HP-automute (Lenovo N100)
923 ultra 2-channel with EAPD (Samsung Ultra tablet PC)
927 6stack-dig ditto with SPDIF
929 3stack-dig ditto with SPDIF
930 laptop 3-jack with hp-jack automute
931 laptop-dig ditto with SPDIF
932 auto auto-config reading BIOS (default)
936 test for testing/debugging purpose, almost all controls
937 can be adjusted. Appearing only when compiled with
941 laptop Basic Laptop config
942 laptop-hp Laptop config for some HP models (subdevice 30A5)
943 laptop-eapd Laptop config with EAPD support
944 test for testing/debugging purpose, almost all controls
945 can be adjusted. Appearing only when compiled with
950 dell-d21 Dell (unknown)
951 dell-d22 Dell (unknown)
952 dell-d23 Dell (unknown)
953 dell-m21 Dell Inspiron 630m, Dell Inspiron 640m
954 dell-m22 Dell Latitude D620, Dell Latitude D820
955 dell-m23 Dell XPS M1710, Dell Precision M90
956 dell-m24 Dell Latitude 120L
957 dell-m25 Dell Inspiron E1505n
958 dell-m26 Dell Inspiron 1501
959 dell-m27 Dell Inspiron E1705/9400
960 gateway Gateway laptops with EAPD control
964 dell-m42 Dell (unknown)
965 dell-m43 Dell Precision
966 dell-m44 Dell Inspiron
971 5stack D945 5stack + SPDIF
972 intel-mac-v1 Intel Mac Type 1
973 intel-mac-v2 Intel Mac Type 2
974 intel-mac-v3 Intel Mac Type 3
975 intel-mac-v4 Intel Mac Type 4
976 intel-mac-v5 Intel Mac Type 5
977 macmini Intel Mac Mini (equivalent with type 3)
978 macbook Intel Mac Book (eq. type 5)
979 macbook-pro-v1 Intel Mac Book Pro 1st generation (eq. type 3)
980 macbook-pro Intel Mac Book Pro 2nd generation (eq. type 3)
981 imac-intel Intel iMac (eq. type 2)
982 imac-intel-20 Intel iMac (newer version) (eq. type 3)
983 dell-d81 Dell (unknown)
984 dell-d82 Dell (unknown)
985 dell-m81 Dell (unknown)
986 dell-m82 Dell XPS M1210
989 ref Reference board, base config
990 m2-2 Some Gateway MX series laptops
991 m6 Some Gateway NX series laptops
992 pa6 Gateway NX860 series
994 STAC9227/9228/9229/927x
997 5stack D965 5stack + SPDIF
998 dell-3stack Dell Dimension E520
1001 vaio Setup for VAIO FE550G/SZ110
1002 vaio-ar Setup for VAIO AR
1004 The model name "genric" is treated as a special case. When this
1005 model is given, the driver uses the generic codec parser without
1006 "codec-patch". It's sometimes good for testing and debugging.
1008 If the default configuration doesn't work and one of the above
1009 matches with your device, report it together with the PCI
1010 subsystem ID (output of "lspci -nv") to ALSA BTS or alsa-devel
1011 ML (see the section "Links and Addresses").
1013 power_save and power_save_controller options are for power-saving
1014 mode. See powersave.txt for details.
1016 Note 2: If you get click noises on output, try the module option
1017 position_fix=1 or 2. position_fix=1 will use the SD_LPIB
1018 register value without FIFO size correction as the current
1019 DMA pointer. position_fix=2 will make the driver to use
1020 the position buffer instead of reading SD_LPIB register.
1021 (Usually SD_LPLIB register is more accurate than the
1024 NB: If you get many "azx_get_response timeout" messages at
1025 loading, it's likely a problem of interrupts (e.g. ACPI irq
1026 routing). Try to boot with options like "pci=noacpi". Also, you
1027 can try "single_cmd=1" module option. This will switch the
1028 communication method between HDA controller and codecs to the
1029 single immediate commands instead of CORB/RIRB. Basically, the
1030 single command mode is provided only for BIOS, and you won't get
1031 unsolicited events, too. But, at least, this works independently
1032 from the irq. Remember this is a last resort, and should be
1033 avoided as much as possible...
1035 MORE NOTES ON "azx_get_response timeout" PROBLEMS:
1036 On some hardwares, you may need to add a proper probe_mask option
1037 to avoid the "azx_get_response timeout" problem above, instead.
1038 This occurs when the access to non-existing or non-working codec slot
1039 (likely a modem one) causes a stall of the communication via HD-audio
1040 bus. You can see which codec slots are probed by enabling
1041 CONFIG_SND_DEBUG_DETECT, or simply from the file name of the codec
1042 proc files. Then limit the slots to probe by probe_mask option.
1043 For example, probe_mask=1 means to probe only the first slot, and
1044 probe_mask=4 means only the third slot.
1046 The power-management is supported.
1051 Module for RME Hammerfall DSP audio interface(s)
1053 This module supports multiple cards.
1055 Note: The firmware data can be automatically loaded via hotplug
1056 when CONFIG_FW_LOADER is set. Otherwise, you need to load
1057 the firmware via hdsploader utility included in alsa-tools
1059 The firmware data is found in alsa-firmware package.
1061 Note: snd-page-alloc module does the job which snd-hammerfall-mem
1062 module did formerly. It will allocate the buffers in advance
1063 when any HDSP cards are found. To make the buffer
1064 allocation sure, load snd-page-alloc module in the early
1065 stage of boot sequence. See "Early Buffer Allocation"
1071 Module for RME HDSP MADI board.
1073 precise_ptr - Enable precise pointer, or disable.
1074 line_outs_monitor - Send playback streams to analog outs by default.
1075 enable_monitor - Enable Analog Out on Channel 63/64 by default.
1077 See hdspm.txt for details.
1082 Module for Envy24 (ICE1712) based PCI sound cards.
1083 * MidiMan M Audio Delta 1010
1084 * MidiMan M Audio Delta 1010LT
1085 * MidiMan M Audio Delta DiO 2496
1086 * MidiMan M Audio Delta 66
1087 * MidiMan M Audio Delta 44
1088 * MidiMan M Audio Delta 410
1089 * MidiMan M Audio Audiophile 2496
1092 * TerraTec EWX 24/96
1093 * TerraTec DMX 6Fire
1095 * Hoontech SoundTrack DSP 24
1096 * Hoontech SoundTrack DSP 24 Value
1097 * Hoontech SoundTrack DSP 24 Media 7.1
1098 * Event Electronics, EZ8
1100 * Lionstracs, Mediastaton
1102 model - Use the given board model, one of the following:
1103 delta1010, dio2496, delta66, delta44, audiophile, delta410,
1104 delta1010lt, vx442, ewx2496, ews88mt, ews88mt_new, ews88d,
1105 dmx6fire, dsp24, dsp24_value, dsp24_71, ez8,
1106 phase88, mediastation
1107 omni - Omni I/O support for MidiMan M-Audio Delta44/66
1108 cs8427_timeout - reset timeout for the CS8427 chip (S/PDIF transceiver)
1109 in msec resolution, default value is 500 (0.5 sec)
1111 This module supports multiple cards and autoprobe. Note: The consumer part
1112 is not used with all Envy24 based cards (for example in the MidiMan Delta
1115 Note: The supported board is detected by reading EEPROM or PCI
1116 SSID (if EEPROM isn't available). You can override the
1117 model by passing "model" module option in case that the
1118 driver isn't configured properly or you want to try another
1124 Module for Envy24HT (VT/ICE1724), Envy24PT (VT1720) based PCI sound cards.
1125 * MidiMan M Audio Revolution 5.1
1126 * MidiMan M Audio Revolution 7.1
1127 * MidiMan M Audio Audiophile 192
1129 * TerraTec Aureon 5.1 Sky
1130 * TerraTec Aureon 7.1 Space
1131 * TerraTec Aureon 7.1 Universe
1134 * AudioTrak Prodigy 7.1
1135 * AudioTrak Prodigy 7.1LT
1136 * AudioTrak Prodigy 192
1138 * Albatron K8X800 Pro II
1139 * Chaintech ZNF3-150
1140 * Chaintech ZNF3-250
1147 model - Use the given board model, one of the following:
1148 revo51, revo71, amp2000, prodigy71, prodigy71lt,
1149 prodigy192, aureon51, aureon71, universe, ap192,
1150 k8x800, phase22, phase28, ms300, av710, se200pci,
1153 This module supports multiple cards and autoprobe.
1155 Note: The supported board is detected by reading EEPROM or PCI
1156 SSID (if EEPROM isn't available). You can override the
1157 model by passing "model" module option in case that the
1158 driver isn't configured properly or you want to try another
1164 Module for Echoaudio Indigo
1166 This module supports multiple cards.
1167 The driver requires the firmware loader support on kernel.
1172 Module for Echoaudio Indigo DJ
1174 This module supports multiple cards.
1175 The driver requires the firmware loader support on kernel.
1180 Module for Echoaudio Indigo IO
1182 This module supports multiple cards.
1183 The driver requires the firmware loader support on kernel.
1188 Module for AC'97 motherboards from Intel and compatibles.
1189 * Intel i810/810E, i815, i820, i830, i84x, MX440
1190 ICH5, ICH6, ICH7, ESB2
1191 * SiS 7012 (SiS 735)
1192 * NVidia NForce, NForce2, NForce3, MCP04, CK804
1194 * AMD AMD768, AMD8111
1197 ac97_clock - AC'97 codec clock base (0 = auto-detect)
1198 ac97_quirk - AC'97 workaround for strange hardware
1199 See "AC97 Quirk Option" section below.
1200 buggy_irq - Enable workaround for buggy interrupts on some
1201 motherboards (default yes on nForce chips,
1203 buggy_semaphore - Enable workaround for hardwares with buggy
1204 semaphores (e.g. on some ASUS laptops)
1206 spdif_aclink - Use S/PDIF over AC-link instead of direct connection
1207 from the controller chip
1208 (0 = off, 1 = on, -1 = default)
1210 This module supports one chip and autoprobe.
1212 Note: the latest driver supports auto-detection of chip clock.
1213 if you still encounter too fast playback, specify the clock
1214 explicitly via the module option "ac97_clock=41194".
1216 Joystick/MIDI ports are not supported by this driver. If your
1217 motherboard has these devices, use the ns558 or snd-mpu401
1218 modules, respectively.
1220 The power-management is supported.
1222 Module snd-intel8x0m
1223 --------------------
1225 Module for Intel ICH (i8x0) chipset MC97 modems.
1226 * Intel i810/810E, i815, i820, i830, i84x, MX440
1228 * SiS 7013 (SiS 735)
1229 * NVidia NForce, NForce2, NForce2s, NForce3
1233 ac97_clock - AC'97 codec clock base (0 = auto-detect)
1235 This module supports one card and autoprobe.
1237 Note: The default index value of this module is -2, i.e. the first
1240 The power-management is supported.
1242 Module snd-interwave
1243 --------------------
1245 Module for Gravis UltraSound PnP, Dynasonic 3-D/Pro, STB Sound Rage 32
1246 and other sound cards based on AMD InterWave (tm) chip.
1248 joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V)
1249 midi - 1 = MIDI UART enable, 0 = MIDI UART disable (default)
1250 pcm_voices - reserved PCM voices for the synthesizer (default 2)
1251 effect - 1 = InterWave effects enable (default 0);
1253 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1255 with isapnp=0, the following options are available:
1257 port - port # for InterWave chip (0x210,0x220,0x230,0x240,0x250,0x260)
1258 irq - IRQ # for InterWave chip (3,5,9,11,12,15)
1259 dma1 - DMA # for InterWave chip (0,1,3,5,6,7)
1260 dma2 - DMA # for InterWave chip (0,1,3,5,6,7,-1=disable)
1262 This module supports multiple cards, autoprobe and ISA PnP.
1264 Module snd-interwave-stb
1265 ------------------------
1267 Module for UltraSound 32-Pro (sound card from STB used by Compaq)
1268 and other sound cards based on AMD InterWave (tm) chip with TEA6330T
1269 circuit for extended control of bass, treble and master volume.
1271 joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V)
1272 midi - 1 = MIDI UART enable, 0 = MIDI UART disable (default)
1273 pcm_voices - reserved PCM voices for the synthesizer (default 2)
1274 effect - 1 = InterWave effects enable (default 0);
1276 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1278 with isapnp=0, the following options are available:
1280 port - port # for InterWave chip (0x210,0x220,0x230,0x240,0x250,0x260)
1281 port_tc - tone control (i2c bus) port # for TEA6330T chip (0x350,0x360,0x370,0x380)
1282 irq - IRQ # for InterWave chip (3,5,9,11,12,15)
1283 dma1 - DMA # for InterWave chip (0,1,3,5,6,7)
1284 dma2 - DMA # for InterWave chip (0,1,3,5,6,7,-1=disable)
1286 This module supports multiple cards, autoprobe and ISA PnP.
1291 Module for Korg 1212 IO PCI card
1293 This module supports multiple cards.
1298 Module for Echoaudio Layla20
1300 This module supports multiple cards.
1301 The driver requires the firmware loader support on kernel.
1306 Module for Echoaudio Layla24
1308 This module supports multiple cards.
1309 The driver requires the firmware loader support on kernel.
1314 Module for Allegro/Maestro3 chips
1316 external_amp - enable external amp (enabled by default)
1317 amp_gpio - GPIO pin number for external amp (0-15) or
1318 -1 for default pin (8 for allegro, 1 for
1321 This module supports autoprobe and multiple chips.
1323 Note: the binding of amplifier is dependent on hardware.
1324 If there is no sound even though all channels are unmuted, try to
1325 specify other gpio connection via amp_gpio option.
1326 For example, a Panasonic notebook might need "amp_gpio=0x0d"
1329 The power-management is supported.
1334 Module for Echoaudio Mia
1336 This module supports multiple cards.
1337 The driver requires the firmware loader support on kernel.
1342 Module for Miro soundcards: miroSOUND PCM 1 pro,
1344 miroSOUND PCM 20 Radio.
1346 port - Port # (0x530,0x604,0xe80,0xf40)
1347 irq - IRQ # (5,7,9,10,11)
1348 dma1 - 1st dma # (0,1,3)
1349 dma2 - 2nd dma # (0,1)
1350 mpu_port - MPU-401 port # (0x300,0x310,0x320,0x330)
1351 mpu_irq - MPU-401 irq # (5,7,9,10)
1352 fm_port - FM Port # (0x388)
1353 wss - enable WSS mode
1354 ide - enable onboard ide support
1359 Module for Digigram miXart8 sound cards.
1361 This module supports multiple cards.
1362 Note: One miXart8 board will be represented as 4 alsa cards.
1363 See MIXART.txt for details.
1365 When the driver is compiled as a module and the hotplug firmware
1366 is supported, the firmware data is loaded via hotplug automatically.
1367 Install the necessary firmware files in alsa-firmware package.
1368 When no hotplug fw loader is available, you need to load the
1369 firmware via mixartloader utility in alsa-tools package.
1374 Module for Echoaudio Mona
1376 This module supports multiple cards.
1377 The driver requires the firmware loader support on kernel.
1382 Module for MPU-401 UART devices.
1384 port - port number or -1 (disable)
1385 irq - IRQ number or -1 (disable)
1386 pnp - PnP detection - 0 = disable, 1 = enable (default)
1388 This module supports multiple devices and PnP.
1393 Module for MOTU MidiTimePiece AV multiport MIDI (on the parallel
1396 port - I/O port # for MTPAV (0x378,0x278, default=0x378)
1397 irq - IRQ # for MTPAV (7,5, default=7)
1398 hwports - number of supported hardware ports, default=8.
1400 Module supports only 1 card. This module has no enable option.
1405 Module for Ego Systems (ESI) Miditerminal 4140
1407 This module supports multiple devices.
1408 Requires parport (CONFIG_PARPORT).
1413 Module for NeoMagic NM256AV/ZX chips
1415 playback_bufsize - max playback frame size in kB (4-128kB)
1416 capture_bufsize - max capture frame size in kB (4-128kB)
1417 force_ac97 - 0 or 1 (disabled by default)
1418 buffer_top - specify buffer top address
1419 use_cache - 0 or 1 (disabled by default)
1420 vaio_hack - alias buffer_top=0x25a800
1421 reset_workaround - enable AC97 RESET workaround for some laptops
1422 reset_workaround2 - enable extended AC97 RESET workaround for some
1425 This module supports one chip and autoprobe.
1427 The power-management is supported.
1429 Note: on some notebooks the buffer address cannot be detected
1430 automatically, or causes hang-up during initialization.
1431 In such a case, specify the buffer top address explicitly via
1432 the buffer_top option.
1434 Sony F250: buffer_top=0x25a800
1435 Sony F270: buffer_top=0x272800
1436 The driver supports only ac97 codec. It's possible to force
1437 to initialize/use ac97 although it's not detected. In such a
1438 case, use force_ac97=1 option - but *NO* guarantee whether it
1441 Note: The NM256 chip can be linked internally with non-AC97
1442 codecs. This driver supports only the AC97 codec, and won't work
1443 with machines with other (most likely CS423x or OPL3SAx) chips,
1444 even though the device is detected in lspci. In such a case, try
1445 other drivers, e.g. snd-cs4232 or snd-opl3sa2. Some has ISA-PnP
1446 but some doesn't have ISA PnP. You'll need to specify isapnp=0
1447 and proper hardware parameters in the case without ISA PnP.
1449 Note: some laptops need a workaround for AC97 RESET. For the
1450 known hardware like Dell Latitude LS and Sony PCG-F305, this
1451 workaround is enabled automatically. For other laptops with a
1452 hard freeze, you can try reset_workaround=1 option.
1454 Note: Dell Latitude CSx laptops have another problem regarding
1455 AC97 RESET. On these laptops, reset_workaround2 option is
1456 turned on as default. This option is worth to try if the
1457 previous reset_workaround option doesn't help.
1459 Note: This driver is really crappy. It's a porting from the
1460 OSS driver, which is a result of black-magic reverse engineering.
1461 The detection of codec will fail if the driver is loaded *after*
1462 X-server as described above. You might be able to force to load
1463 the module, but it may result in hang-up. Hence, make sure that
1464 you load this module *before* X if you encounter this kind of
1470 Module for Yamaha OPL3-SA2/SA3 sound cards.
1472 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1474 with isapnp=0, the following options are available:
1476 port - control port # for OPL3-SA chip (0x370)
1477 sb_port - SB port # for OPL3-SA chip (0x220,0x240)
1478 wss_port - WSS port # for OPL3-SA chip (0x530,0xe80,0xf40,0x604)
1479 midi_port - port # for MPU-401 UART (0x300,0x330), -1 = disable
1480 fm_port - FM port # for OPL3-SA chip (0x388), -1 = disable
1481 irq - IRQ # for OPL3-SA chip (5,7,9,10)
1482 dma1 - first DMA # for Yamaha OPL3-SA chip (0,1,3)
1483 dma2 - second DMA # for Yamaha OPL3-SA chip (0,1,3), -1 = disable
1485 This module supports multiple cards and ISA PnP. It does not support
1486 autoprobe (if ISA PnP is not used) thus all ports must be specified!!!
1488 The power-management is supported.
1490 Module snd-opti92x-ad1848
1491 -------------------------
1493 Module for sound cards based on OPTi 82c92x and Analog Devices AD1848 chips.
1494 Module works with OAK Mozart cards as well.
1496 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1498 with isapnp=0, the following options are available:
1500 port - port # for WSS chip (0x530,0xe80,0xf40,0x604)
1501 mpu_port - port # for MPU-401 UART (0x300,0x310,0x320,0x330)
1502 fm_port - port # for OPL3 device (0x388)
1503 irq - IRQ # for WSS chip (5,7,9,10,11)
1504 mpu_irq - IRQ # for MPU-401 UART (5,7,9,10)
1505 dma1 - first DMA # for WSS chip (0,1,3)
1507 This module supports only one card, autoprobe and PnP.
1509 Module snd-opti92x-cs4231
1510 -------------------------
1512 Module for sound cards based on OPTi 82c92x and Crystal CS4231 chips.
1514 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1516 with isapnp=0, the following options are available:
1518 port - port # for WSS chip (0x530,0xe80,0xf40,0x604)
1519 mpu_port - port # for MPU-401 UART (0x300,0x310,0x320,0x330)
1520 fm_port - port # for OPL3 device (0x388)
1521 irq - IRQ # for WSS chip (5,7,9,10,11)
1522 mpu_irq - IRQ # for MPU-401 UART (5,7,9,10)
1523 dma1 - first DMA # for WSS chip (0,1,3)
1524 dma2 - second DMA # for WSS chip (0,1,3)
1526 This module supports only one card, autoprobe and PnP.
1531 Module for sound cards based on OPTi 82c93x chips.
1533 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1535 with isapnp=0, the following options are available:
1537 port - port # for WSS chip (0x530,0xe80,0xf40,0x604)
1538 mpu_port - port # for MPU-401 UART (0x300,0x310,0x320,0x330)
1539 fm_port - port # for OPL3 device (0x388)
1540 irq - IRQ # for WSS chip (5,7,9,10,11)
1541 mpu_irq - IRQ # for MPU-401 UART (5,7,9,10)
1542 dma1 - first DMA # for WSS chip (0,1,3)
1543 dma2 - second DMA # for WSS chip (0,1,3)
1545 This module supports only one card, autoprobe and PnP.
1550 Module for Digigram PCXHR boards
1552 This module supports multiple cards.
1554 Module snd-portman2x4
1555 ---------------------
1557 Module for Midiman Portman 2x4 parallel port MIDI interface
1559 This module supports multiple cards.
1561 Module snd-powermac (on ppc only)
1562 ---------------------------------
1564 Module for PowerMac, iMac and iBook on-board soundchips
1566 enable_beep - enable beep using PCM (enabled as default)
1568 Module supports autoprobe a chip.
1570 Note: the driver may have problems regarding endianess.
1572 The power-management is supported.
1574 Module snd-pxa2xx-ac97 (on arm only)
1575 ------------------------------------
1577 Module for AC97 driver for the Intel PXA2xx chip
1579 For ARM architecture only.
1581 The power-management is supported.
1586 Module for Conexant Riptide chip
1588 joystick_port - Joystick port # (default: 0x200)
1589 mpu_port - MPU401 port # (default: 0x330)
1590 opl3_port - OPL3 port # (default: 0x388)
1592 This module supports multiple cards.
1593 The driver requires the firmware loader support on kernel.
1594 You need to install the firmware file "riptide.hex" to the standard
1595 firmware path (e.g. /lib/firmware).
1600 Module for RME Digi32, Digi32 Pro and Digi32/8 (Sek'd Prodif32,
1601 Prodif96 and Prodif Gold) sound cards.
1603 This module supports multiple cards.
1608 Module for RME Digi96, Digi96/8 and Digi96/8 PRO/PAD/PST sound cards.
1610 This module supports multiple cards.
1615 Module for RME Digi9652 (Hammerfall, Hammerfall-Light) sound cards.
1617 precise_ptr - Enable precise pointer (doesn't work reliably).
1620 This module supports multiple cards.
1622 Note: snd-page-alloc module does the job which snd-hammerfall-mem
1623 module did formerly. It will allocate the buffers in advance
1624 when any RME9652 cards are found. To make the buffer
1625 allocation sure, load snd-page-alloc module in the early
1626 stage of boot sequence. See "Early Buffer Allocation"
1629 Module snd-sa11xx-uda1341 (on arm only)
1630 ---------------------------------------
1632 Module for Philips UDA1341TS on Compaq iPAQ H3600 sound card.
1634 Module supports only one card.
1635 Module has no enable and index options.
1637 The power-management is supported.
1642 Module for 8-bit SoundBlaster cards: SoundBlaster 1.0,
1646 port - port # for SB DSP chip (0x220,0x240,0x260)
1647 irq - IRQ # for SB DSP chip (5,7,9,10)
1648 dma8 - DMA # for SB DSP chip (1,3)
1650 This module supports multiple cards and autoprobe.
1652 The power-management is supported.
1654 Module snd-sb16 and snd-sbawe
1655 -----------------------------
1657 Module for 16-bit SoundBlaster cards: SoundBlaster 16 (PnP),
1658 SoundBlaster AWE 32 (PnP),
1659 SoundBlaster AWE 64 PnP
1661 mic_agc - Mic Auto-Gain-Control - 0 = disable, 1 = enable (default)
1662 csp - ASP/CSP chip support - 0 = disable (default), 1 = enable
1663 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1665 with isapnp=0, the following options are available:
1667 port - port # for SB DSP 4.x chip (0x220,0x240,0x260)
1668 mpu_port - port # for MPU-401 UART (0x300,0x330), -1 = disable
1669 awe_port - base port # for EMU8000 synthesizer (0x620,0x640,0x660)
1670 (snd-sbawe module only)
1671 irq - IRQ # for SB DSP 4.x chip (5,7,9,10)
1672 dma8 - 8-bit DMA # for SB DSP 4.x chip (0,1,3)
1673 dma16 - 16-bit DMA # for SB DSP 4.x chip (5,6,7)
1675 This module supports multiple cards, autoprobe and ISA PnP.
1677 Note: To use Vibra16X cards in 16-bit half duplex mode, you must
1678 disable 16bit DMA with dma16 = -1 module parameter.
1679 Also, all Sound Blaster 16 type cards can operate in 16-bit
1680 half duplex mode through 8-bit DMA channel by disabling their
1683 The power-management is supported.
1688 Module for Gallant SC-6000 soundcard.
1690 port - Port # (0x220 or 0x240)
1691 mss_port - MSS Port # (0x530 or 0xe80)
1692 irq - IRQ # (5,7,9,10,11)
1693 mpu_irq - MPU-401 IRQ # (5,7,9,10) ,0 - no MPU-401 irq
1696 This module supports multiple cards.
1698 This card is also known as Audio Excel DSP 16 or Zoltrix AV302.
1703 Module for Aztech Sound Galaxy sound card.
1705 sbport - Port # for SB16 interface (0x220,0x240)
1706 wssport - Port # for WSS interface (0x530,0xe80,0xf40,0x604)
1707 irq - IRQ # (7,9,10,11)
1710 This module supports multiple cards.
1712 The power-management is supported.
1717 Module for ENSONIQ SoundScape PnP cards.
1719 port - Port # (PnP setup)
1720 wss_port - WSS Port # (PnP setup)
1721 irq - IRQ # (PnP setup)
1722 mpu_irq - MPU-401 IRQ # (PnP setup)
1723 dma - DMA # (PnP setup)
1724 dma2 - 2nd DMA # (PnP setup, -1 to disable)
1726 This module supports multiple cards. ISA PnP must be enabled.
1727 You need sscape_ctl tool in alsa-tools package for loading
1730 Module snd-sun-amd7930 (on sparc only)
1731 --------------------------------------
1733 Module for AMD7930 sound chips found on Sparcs.
1735 This module supports multiple cards.
1737 Module snd-sun-cs4231 (on sparc only)
1738 -------------------------------------
1740 Module for CS4231 sound chips found on Sparcs.
1742 This module supports multiple cards.
1744 Module snd-sun-dbri (on sparc only)
1745 -----------------------------------
1747 Module for DBRI sound chips found on Sparcs.
1749 This module supports multiple cards.
1751 Module snd-wavefront
1752 --------------------
1754 Module for Turtle Beach Maui, Tropez and Tropez+ sound cards.
1756 use_cs4232_midi - Use CS4232 MPU-401 interface
1757 (inaccessibly located inside your computer)
1758 isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
1760 with isapnp=0, the following options are available:
1762 cs4232_pcm_port - Port # for CS4232 PCM interface.
1763 cs4232_pcm_irq - IRQ # for CS4232 PCM interface (5,7,9,11,12,15).
1764 cs4232_mpu_port - Port # for CS4232 MPU-401 interface.
1765 cs4232_mpu_irq - IRQ # for CS4232 MPU-401 interface (9,11,12,15).
1766 ics2115_port - Port # for ICS2115
1767 ics2115_irq - IRQ # for ICS2115
1768 fm_port - FM OPL-3 Port #
1769 dma1 - DMA1 # for CS4232 PCM interface.
1770 dma2 - DMA2 # for CS4232 PCM interface.
1772 The below are options for wavefront_synth features:
1773 wf_raw - Assume that we need to boot the OS (default:no)
1774 If yes, then during driver loading, the state of the board is
1775 ignored, and we reset the board and load the firmware anyway.
1776 fx_raw - Assume that the FX process needs help (default:yes)
1777 If false, we'll leave the FX processor in whatever state it is
1778 when the driver is loaded. The default is to download the
1779 microprogram and associated coefficients to set it up for
1780 "default" operation, whatever that means.
1781 debug_default - Debug parameters for card initialization
1782 wait_usecs - How long to wait without sleeping, usecs
1784 This magic number seems to give pretty optimal throughput
1785 based on my limited experimentation.
1786 If you want to play around with it and find a better value, be
1787 my guest. Remember, the idea is to get a number that causes us
1788 to just busy wait for as many WaveFront commands as possible,
1789 without coming up with a number so large that we hog the whole
1791 Specifically, with this number, out of about 134,000 status
1792 waits, only about 250 result in a sleep.
1793 sleep_interval - How long to sleep when waiting for reply
1795 sleep_tries - How many times to try sleeping during a wait
1797 ospath - Pathname to processed ICS2115 OS firmware
1798 (default:wavefront.os)
1799 The path name of the ISC2115 OS firmware. In the recent
1800 version, it's handled via firmware loader framework, so it
1801 must be installed in the proper path, typically,
1803 reset_time - How long to wait for a reset to take effect
1805 ramcheck_time - How many seconds to wait for the RAM test
1807 osrun_time - How many seconds to wait for the ICS2115 OS
1810 This module supports multiple cards and ISA PnP.
1812 Note: the firmware file "wavefront.os" was located in the earlier
1813 version in /etc. Now it's loaded via firmware loader, and
1814 must be in the proper firmware path, such as /lib/firmware.
1815 Copy (or symlink) the file appropriately if you get an error
1816 regarding firmware downloading after upgrading the kernel.
1818 Module snd-sonicvibes
1819 ---------------------
1821 Module for S3 SonicVibes PCI sound cards.
1822 * PINE Schubert 32 PCI
1824 reverb - Reverb Enable - 1 = enable, 0 = disable (default)
1825 - SoundCard must have onboard SRAM for this.
1826 mge - Mic Gain Enable - 1 = enable, 0 = disable (default)
1828 This module supports multiple cards and autoprobe.
1830 Module snd-serial-u16550
1831 ------------------------
1833 Module for UART16550A serial MIDI ports.
1835 port - port # for UART16550A chip
1836 irq - IRQ # for UART16550A chip, -1 = poll mode
1837 speed - speed in bauds (9600,19200,38400,57600,115200)
1839 base - base for divisor in bauds (57600,115200,230400,460800)
1841 outs - number of MIDI ports in a serial port (1-4)
1843 adaptor - Type of adaptor.
1844 0 = Soundcanvas, 1 = MS-124T, 2 = MS-124W S/A,
1845 3 = MS-124W M/B, 4 = Generic
1847 This module supports multiple cards. This module does not support autoprobe
1848 thus the main port must be specified!!! Other options are optional.
1853 Module for Trident 4DWave DX/NX sound cards.
1854 * Best Union Miss Melody 4DWave PCI
1856 * Warpspeed ONSpeed 4DWave PCI
1859 * CHIC True Sound 4Dwave
1860 * Shark Predator4D-PCI
1861 * Jaton SonicWave 4D
1863 pcm_channels - max channels (voices) reserved for PCM
1864 wavetable_size - max wavetable size in kB (4-?kb)
1866 This module supports multiple cards and autoprobe.
1868 The power-management is supported.
1870 Module snd-usb-audio
1871 --------------------
1873 Module for USB audio and USB MIDI devices.
1875 vid - Vendor ID for the device (optional)
1876 pid - Product ID for the device (optional)
1877 device_setup - Device specific magic number (optional)
1878 - Influence depends on the device
1881 This module supports multiple devices, autoprobe and hotplugging.
1883 Module snd-usb-caiaq
1884 --------------------
1886 Module for caiaq UB audio interfaces,
1887 * Native Instruments RigKontrol2
1888 * Native Instruments Kore Controller
1889 * Native Instruments Audio Kontrol 1
1890 * Native Instruments Audio 8 DJ
1892 This module supports multiple devices, autoprobe and hotplugging.
1894 Module snd-usb-usx2y
1895 --------------------
1897 Module for Tascam USB US-122, US-224 and US-428 devices.
1899 This module supports multiple devices, autoprobe and hotplugging.
1901 Note: you need to load the firmware via usx2yloader utility included
1902 in alsa-tools and alsa-firmware packages.
1907 Module for AC'97 motherboards based on VIA 82C686A/686B, 8233,
1908 8233A, 8233C, 8235, 8237 (south) bridge.
1910 mpu_port - 0x300,0x310,0x320,0x330, otherwise obtain BIOS setup
1912 joystick - Enable joystick (default off) [VIA686A/686B only]
1913 ac97_clock - AC'97 codec clock base (default 48000Hz)
1914 dxs_support - support DXS channels,
1915 0 = auto (default), 1 = enable, 2 = disable,
1916 3 = 48k only, 4 = no VRA, 5 = enable any sample
1917 rate and different sample rates on different
1919 [VIA8233/C, 8235, 8237 only]
1920 ac97_quirk - AC'97 workaround for strange hardware
1921 See "AC97 Quirk Option" section below.
1923 This module supports one chip and autoprobe.
1925 Note: on some SMP motherboards like MSI 694D the interrupts might
1926 not be generated properly. In such a case, please try to
1927 set the SMP (or MPS) version on BIOS to 1.1 instead of
1928 default value 1.4. Then the interrupt number will be
1929 assigned under 15. You might also upgrade your BIOS.
1931 Note: VIA8233/5/7 (not VIA8233A) can support DXS (direct sound)
1932 channels as the first PCM. On these channels, up to 4
1933 streams can be played at the same time, and the controller
1934 can perform sample rate conversion with separate rates for
1936 As default (dxs_support = 0), 48k fixed rate is chosen
1937 except for the known devices since the output is often
1938 noisy except for 48k on some mother boards due to the
1940 Please try once dxs_support=5 and if it works on other
1941 sample rates (e.g. 44.1kHz of mp3 playback), please let us
1942 know the PCI subsystem vendor/device id's (output of
1944 If dxs_support=5 does not work, try dxs_support=4; if it
1945 doesn't work too, try dxs_support=1. (dxs_support=1 is
1946 usually for old motherboards. The correct implemented
1947 board should work with 4 or 5.) If it still doesn't
1948 work and the default setting is ok, dxs_support=3 is the
1949 right choice. If the default setting doesn't work at all,
1950 try dxs_support=2 to disable the DXS channels.
1951 In any cases, please let us know the result and the
1952 subsystem vendor/device ids. See "Links and Addresses"
1955 Note: for the MPU401 on VIA823x, use snd-mpu401 driver
1956 additionally. The mpu_port option is for VIA686 chips only.
1958 The power-management is supported.
1960 Module snd-via82xx-modem
1961 ------------------------
1963 Module for VIA82xx AC97 modem
1965 ac97_clock - AC'97 codec clock base (default 48000Hz)
1967 This module supports one card and autoprobe.
1969 Note: The default index value of this module is -2, i.e. the first
1972 The power-management is supported.
1977 Module for virtual rawmidi devices.
1978 This module creates virtual rawmidi devices which communicate
1979 to the corresponding ALSA sequencer ports.
1981 midi_devs - MIDI devices # (1-4, default=4)
1983 This module supports multiple cards.
1988 Module for Digigram VX-Pocket VX222, V222 v2 and Mic cards.
1990 mic - Enable Microphone on V222 Mic (NYI)
1991 ibl - Capture IBL size. (default = 0, minimum size)
1993 This module supports multiple cards.
1995 When the driver is compiled as a module and the hotplug firmware
1996 is supported, the firmware data is loaded via hotplug automatically.
1997 Install the necessary firmware files in alsa-firmware package.
1998 When no hotplug fw loader is available, you need to load the
1999 firmware via vxloader utility in alsa-tools package. To invoke
2000 vxloader automatically, add the following to /etc/modprobe.conf
2002 install snd-vx222 /sbin/modprobe --first-time -i snd-vx222 && /usr/bin/vxloader
2004 (for 2.2/2.4 kernels, add "post-install /usr/bin/vxloader" to
2005 /etc/modules.conf, instead.)
2006 IBL size defines the interrupts period for PCM. The smaller size
2007 gives smaller latency but leads to more CPU consumption, too.
2008 The size is usually aligned to 126. As default (=0), the smallest
2009 size is chosen. The possible IBL values can be found in
2010 /proc/asound/cardX/vx-status proc file.
2012 The power-management is supported.
2017 Module for Digigram VX-Pocket VX2 and 440 PCMCIA cards.
2019 ibl - Capture IBL size. (default = 0, minimum size)
2021 This module supports multiple cards. The module is compiled only when
2022 PCMCIA is supported on kernel.
2024 With the older 2.6.x kernel, to activate the driver via the card
2025 manager, you'll need to set up /etc/pcmcia/vxpocket.conf. See the
2026 sound/pcmcia/vx/vxpocket.c. 2.6.13 or later kernel requires no
2027 longer require a config file.
2029 When the driver is compiled as a module and the hotplug firmware
2030 is supported, the firmware data is loaded via hotplug automatically.
2031 Install the necessary firmware files in alsa-firmware package.
2032 When no hotplug fw loader is available, you need to load the
2033 firmware via vxloader utility in alsa-tools package.
2035 About capture IBL, see the description of snd-vx222 module.
2037 Note: snd-vxp440 driver is merged to snd-vxpocket driver since
2040 The power-management is supported.
2045 Module for Yamaha PCI chips (YMF72x, YMF74x & YMF75x).
2047 mpu_port - 0x300,0x330,0x332,0x334, 0 (disable) by default,
2048 1 (auto-detect for YMF744/754 only)
2049 fm_port - 0x388,0x398,0x3a0,0x3a8, 0 (disable) by default
2050 1 (auto-detect for YMF744/754 only)
2051 joystick_port - 0x201,0x202,0x204,0x205, 0 (disable) by default,
2053 rear_switch - enable shared rear/line-in switch (bool)
2055 This module supports autoprobe and multiple chips.
2057 The power-management is supported.
2059 Module snd-pdaudiocf
2060 --------------------
2062 Module for Sound Core PDAudioCF sound card.
2064 The power-management is supported.
2070 The ac97_quirk option is used to enable/override the workaround for
2071 specific devices on drivers for on-board AC'97 controllers like
2072 snd-intel8x0. Some hardware have swapped output pins between Master
2073 and Headphone, or Surround (thanks to confusion of AC'97
2074 specifications from version to version :-)
2076 The driver provides the auto-detection of known problematic devices,
2077 but some might be unknown or wrongly detected. In such a case, pass
2078 the proper value with this option.
2080 The following strings are accepted:
2081 - default Don't override the default setting
2082 - none Disable the quirk
2083 - hp_only Bind Master and Headphone controls as a single control
2084 - swap_hp Swap headphone and master controls
2085 - swap_surround Swap master and surround controls
2086 - ad_sharing For AD1985, turn on OMS bit and use headphone
2087 - alc_jack For ALC65x, turn on the jack sense mode
2088 - inv_eapd Inverted EAPD implementation
2089 - mute_led Bind EAPD bit for turning on/off mute LED
2091 For backward compatibility, the corresponding integer value -1, 0,
2092 ... are accepted, too.
2094 For example, if "Master" volume control has no effect on your device
2095 but only "Headphone" does, pass ac97_quirk=hp_only module option.
2098 Configuring Non-ISAPNP Cards
2099 ============================
2101 When the kernel is configured with ISA-PnP support, the modules
2102 supporting the isapnp cards will have module options "isapnp".
2103 If this option is set, *only* the ISA-PnP devices will be probed.
2104 For probing the non ISA-PnP cards, you have to pass "isapnp=0" option
2105 together with the proper i/o and irq configuration.
2107 When the kernel is configured without ISA-PnP support, isapnp option
2108 will be not built in.
2111 Module Autoloading Support
2112 ==========================
2114 The ALSA drivers can be loaded automatically on demand by defining
2115 module aliases. The string 'snd-card-%1' is requested for ALSA native
2116 devices where %i is sound card number from zero to seven.
2118 To auto-load an ALSA driver for OSS services, define the string
2119 'sound-slot-%i' where %i means the slot number for OSS, which
2120 corresponds to the card index of ALSA. Usually, define this
2121 as the same card module.
2123 An example configuration for a single emu10k1 card is like below:
2124 ----- /etc/modprobe.conf
2125 alias snd-card-0 snd-emu10k1
2126 alias sound-slot-0 snd-emu10k1
2127 ----- /etc/modprobe.conf
2129 The available number of auto-loaded sound cards depends on the module
2130 option "cards_limit" of snd module. As default it's set to 1.
2131 To enable the auto-loading of multiple cards, specify the number of
2132 sound cards in that option.
2134 When multiple cards are available, it'd better to specify the index
2135 number for each card via module option, too, so that the order of
2136 cards is kept consistent.
2138 An example configuration for two sound cards is like below:
2140 ----- /etc/modprobe.conf
2142 options snd cards_limit=2
2143 alias snd-card-0 snd-interwave
2144 alias snd-card-1 snd-ens1371
2145 options snd-interwave index=0
2146 options snd-ens1371 index=1
2148 alias sound-slot-0 snd-interwave
2149 alias sound-slot-1 snd-ens1371
2150 ----- /etc/modprobe.conf
2152 In this example, the interwave card is always loaded as the first card
2153 (index 0) and ens1371 as the second (index 1).
2155 Alternative (and new) way to fixate the slot assignment is to use
2156 "slots" option of snd module. In the case above, specify like the
2159 options snd slots=snd-interwave,snd-ens1371
2161 Then, the first slot (#0) is reserved for snd-interwave driver, and
2162 the second (#1) for snd-ens1371. You can omit index option in each
2163 driver if slots option is used (although you can still have them at
2164 the same time as long as they don't conflict).
2166 The slots option is especially useful for avoiding the possible
2167 hot-plugging and the resultant slot conflict. For example, in the
2168 case above again, the first two slots are already reserved. If any
2169 other driver (e.g. snd-usb-audio) is loaded before snd-interwave or
2170 snd-ens1371, it will be assigned to the third or later slot.
2173 ALSA PCM devices to OSS devices mapping
2174 =======================================
2176 /dev/snd/pcmC0D0[c|p] -> /dev/audio0 (/dev/audio) -> minor 4
2177 /dev/snd/pcmC0D0[c|p] -> /dev/dsp0 (/dev/dsp) -> minor 3
2178 /dev/snd/pcmC0D1[c|p] -> /dev/adsp0 (/dev/adsp) -> minor 12
2179 /dev/snd/pcmC1D0[c|p] -> /dev/audio1 -> minor 4+16 = 20
2180 /dev/snd/pcmC1D0[c|p] -> /dev/dsp1 -> minor 3+16 = 19
2181 /dev/snd/pcmC1D1[c|p] -> /dev/adsp1 -> minor 12+16 = 28
2182 /dev/snd/pcmC2D0[c|p] -> /dev/audio2 -> minor 4+32 = 36
2183 /dev/snd/pcmC2D0[c|p] -> /dev/dsp2 -> minor 3+32 = 39
2184 /dev/snd/pcmC2D1[c|p] -> /dev/adsp2 -> minor 12+32 = 44
2186 The first number from /dev/snd/pcmC{X}D{Y}[c|p] expression means
2187 sound card number and second means device number. The ALSA devices
2188 have either 'c' or 'p' suffix indicating the direction, capture and
2189 playback, respectively.
2191 Please note that the device mapping above may be varied via the module
2192 options of snd-pcm-oss module.
2195 Proc interfaces (/proc/asound)
2196 ==============================
2198 /proc/asound/card#/pcm#[cp]/oss
2199 -------------------------------
2200 String "erase" - erase all additional informations about OSS applications
2201 String "<app_name> <fragments> <fragment_size> [<options>]"
2203 <app_name> - name of application with (higher priority) or without path
2204 <fragments> - number of fragments or zero if auto
2205 <fragment_size> - size of fragment in bytes or zero if auto
2206 <options> - optional parameters
2207 - disable the application tries to open a pcm device for
2208 this channel but does not want to use it.
2209 (Cause a bug or mmap needs)
2210 It's good for Quake etc...
2211 - direct don't use plugins
2212 - block force block mode (rvplayer)
2213 - non-block force non-block mode
2214 - whole-frag write only whole fragments (optimization affecting
2216 - no-silence do not fill silence ahead to avoid clicks
2217 - buggy-ptr Returns the whitespace blocks in GETOPTR ioctl
2218 instead of filled blocks
2220 Example: echo "x11amp 128 16384" > /proc/asound/card0/pcm0p/oss
2221 echo "squake 0 0 disable" > /proc/asound/card0/pcm0c/oss
2222 echo "rvplayer 0 0 block" > /proc/asound/card0/pcm0p/oss
2225 Early Buffer Allocation
2226 =======================
2228 Some drivers (e.g. hdsp) require the large contiguous buffers, and
2229 sometimes it's too late to find such spaces when the driver module is
2230 actually loaded due to memory fragmentation. You can pre-allocate the
2231 PCM buffers by loading snd-page-alloc module and write commands to its
2232 proc file in prior, for example, in the early boot stage like
2233 /etc/init.d/*.local scripts.
2235 Reading the proc file /proc/drivers/snd-page-alloc shows the current
2236 usage of page allocation. In writing, you can send the following
2237 commands to the snd-page-alloc driver:
2239 - add VENDOR DEVICE MASK SIZE BUFFERS
2241 VENDOR and DEVICE are PCI vendor and device IDs. They take
2242 integer numbers (0x prefix is needed for the hex).
2243 MASK is the PCI DMA mask. Pass 0 if not restricted.
2244 SIZE is the size of each buffer to allocate. You can pass
2245 k and m suffix for KB and MB. The max number is 16MB.
2246 BUFFERS is the number of buffers to allocate. It must be greater
2247 than 0. The max number is 4.
2251 This will erase the all pre-allocated buffers which are not in
2258 ALSA project homepage
2259 http://www.alsa-project.org
2261 ALSA Bug Tracking System
2262 https://bugtrack.alsa-project.org/bugs/
2265 mailto:alsa-devel@alsa-project.org
git://ftp.safe.ca / safe / jmp / linux-2.6 / blob