[PATCH 2/2] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8

[Matthew Garrett]

On Mon, 2013-09-09 at 17:21 +0200, Daniel Vetter wrote:

> If Win8 is as broken as we are I'm ok with the module option. It just
> sounded to me like right now we don't know of a way to make all machines
> somewhat happy, combined with the other pile of random backlight issues
> the assumption that we do something (maybe something a bit racy) that
> windows doesn't do isn't too far-fetched. So I'm not wary of the machines
> where the aml is busted for acpi_os=win8, but for the others where this
> broke stuff.

Windows 8 isn't broken because (as far as we can tell) the Intel drivers
under Windows 8 never use the ACPI backlight set function. Of course, it
would be nice to have that confirmed by Intel.

-- 
Matthew Garrett <matthew.garrett at nebula.com>