msi-laptop: fingers off backlight if video.ko is serving this functionality

Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/misc/msi-laptop.c b/drivers/misc/msi-laptop.c
index de898c6..759763d 100644 (file)
--- a/drivers/misc/msi-laptop.c
+++ b/drivers/misc/msi-laptop.c
@@ -347,12 +347,16 @@ static int __init msi_init(void)
 
        /* Register backlight stuff */
 
-       msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
-                                               &msibl_ops);
-       if (IS_ERR(msibl_device))
-               return PTR_ERR(msibl_device);
-
-       msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+       if (acpi_video_backlight_support()) {
+               printk(KERN_INFO "MSI: Brightness ignored, must be controlled "
+                      "by ACPI video driver\n");
+       } else {
+               msibl_device = backlight_device_register("msi-laptop-bl", NULL,
+                                                        NULL, &msibl_ops);
+               if (IS_ERR(msibl_device))
+                       return PTR_ERR(msibl_device);
+               msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+       }
 
        ret = platform_driver_register(&msipf_driver);
        if (ret)