[Bug 68355] [HSW ULT] eDP backlight regression at 1920x1080

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68355

--- Comment #8 from Rafael J. Wysocki <rjw at sisk.pl> ---
On Thursday, August 22, 2013 09:27:26 PM bugzilla-daemon at freedesktop.org wrote:
> https://bugs.freedesktop.org/show_bug.cgi?id=68355
> 
> --- Comment #7 from Trevor Bortins <enabfluw at gmail.com> ---
> Here's the results of the bisect:
> 
> c04c697cf1fe8f0962ccd3c2392a9b637a5307aa is the first bad commit
> commit c04c697cf1fe8f0962ccd3c2392a9b637a5307aa
> Author: Matthew Garrett <matthew.garrett at nebula.com>
> Date:   Tue Jul 16 17:08:16 2013 +0000
> 
>     ACPI / video: Always call acpi_video_init_brightness() on init
> 
>     We have to call acpi_video_init_brightness() even if we're not going
>     to initialise the backlight - Thinkpads seem to use this as the
>     trigger for enabling ACPI notifications rather than handling it in
>     firmware.
> 
>     [rjw: Drop the brightness object created by
>      acpi_video_init_brightness() if we are not going to use it.]
>     Signed-off-by: Matthew Garrett <matthew.garrett at nebula.com>
>     Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
> 
> :040000 040000 cd4ce0b293e303c610af578ffd39c1b63decac3a
> c16757184ad041a368b13952e00e05998f3298fc M    drivers

If reverting that commit helps, I think we can revert it for 3.11 easily.

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