ACPI: fix Compaq Evo N800c (Pentium 4m) boot hang regression

Don't disable ARB_DISABLE when the familary ID is 0x0F.

http://bugzilla.kernel.org/show_bug.cgi?id=14211

This was a 2.6.31 regression, and so this patch
needs to be applied to 2.6.31.stable

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index 8c44c23..59cdfa4 100644 (file)
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -48,7 +48,7 @@ void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
         * P4, Core and beyond CPUs
         */
        if (c->x86_vendor == X86_VENDOR_INTEL &&
-           (c->x86 > 0x6 || (c->x86 == 6 && c->x86_model >= 14)))
+           (c->x86 > 0xf || (c->x86 == 6 && c->x86_model >= 14)))
                        flags->bm_control = 0;
 }
 EXPORT_SYMBOL(acpi_processor_power_init_bm_check);