https://bugzilla.kernel.org/show_bug.cgi?id=42833
--- Comment #11 from lukacs.ben...@gmail.com 2012-03-19 19:26:35 ---
(In reply to comment #9)
> 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"?
Both with acpi_osi="!Windows 2009" and with acpi_osi="!Windows 2006" boot the
system, but the problem still exist.
Luckily with acpi_osi="Linux" everything works fine just like with
"acpi_backlight=vendor", however, when the system boots it starts with the
lowest backlight level.
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