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

[bugzilla-daemon at freedesktop.org]

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

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