https://bugzilla.kernel.org/show_bug.cgi?id=42833
--- Comment #9 from Zhang Rui <rui.zh...@intel.com> 2012-03-19 08:17:15 ---
I'm confused by the ACPI brightness control implement on this machine.
Method (_BCM, 1, NotSerialized)
{
If (LEqual (BOWN, Zero))
{
Store (Subtract (Divide (Arg0, 0x0A, ), One),
Local0)
Store (Local0, BRTN)
Acquire (^^^^LPCB.EC0.MUT1, 0xFFFF)
Store (Local0, ^^^^LPCB.EC0.BLVL)
Release (^^^^LPCB.EC0.MUT1)
If (LEqual (OSYS, 0x03E8))
{
/* update IGD LBES field in case it's "Linux"
*/
}
If (LLess (OSYS, 0x07D6))
{
/* Need wmi support if it is not Vista or Win7
*/
}
}
}
Does this mean that updating EC0.BLVL can change the backlight in Windows Vista
and Win7? Or windows Vista and Win7 doesn't use ACPI backlight control at all?
Hi, Lukacs,
will you please check
1) if the brightness works when you boot the kernel with both
acpi_osi="!Windows 2009" and acpi_osi="!Windows 2006" ?
2) if the brightness works when you boot the kernel with acpi_osi="Linux"?
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