Re: [PATCH 1/3] X86 drivers: Introduce msi-wmi driver

Thomas Renninger
2009-10-26T19:54:51Z

On Monday 26 October 2009 06:04:21 pm Matthew Garrett wrote:
> Only one question - does hitting the brightness keys automatically
> change the backlight on non-ACPI backlight hardware driven by this?

Hmm, not sure what you mean with non-ACPI driven.
I can only talk about this specific model which only provides WMI (thus
also ACPI driven) backlight functionality. No generic ACPI backlight functions
as it seems only WindowsXP and not Vista is supported.

The OS has to react on WMI notifications and the brightness change only
happens when writing to IO via ACPI WSAA (WMI set block) function.
So I expect the answer to your question is no.

Thomas

BTW: Does someone know already whether Windows 7 also requires
generic ACPI backlight functions? Does someone have a good pointer to
some published Windows 7 ACPI documentation/requirements?