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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [HSW ULT] eDP backlight regression at 1920x1080"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68355#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [HSW ULT] eDP backlight regression at 1920x1080"
href="https://bugs.freedesktop.org/show_bug.cgi?id=68355">bug 68355</a>
from <span class="vcard"><a class="email" href="mailto:rjw@sisk.pl" title="Rafael J. Wysocki <rjw@sisk.pl>"> <span class="fn">Rafael J. Wysocki</span></a>
</span></b>
<pre>On Thursday, August 22, 2013 09:27:26 PM <a href="mailto:bugzilla-daemon@freedesktop.org">bugzilla-daemon@freedesktop.org</a> wrote:
<span class="quote">> <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [HSW ULT] eDP backlight regression at 1920x1080"
href="show_bug.cgi?id=68355">https://bugs.freedesktop.org/show_bug.cgi?id=68355</a>
>
> --- <a href="show_bug.cgi?id=68355#c7">Comment #7</a> from Trevor Bortins <<a href="mailto:enabfluw@gmail.com">enabfluw@gmail.com</a>> ---
> Here's the results of the bisect:
>
> c04c697cf1fe8f0962ccd3c2392a9b637a5307aa is the first bad commit
> commit c04c697cf1fe8f0962ccd3c2392a9b637a5307aa
> Author: Matthew Garrett <<a href="mailto:matthew.garrett@nebula.com">matthew.garrett@nebula.com</a>>
> 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 <<a href="mailto:matthew.garrett@nebula.com">matthew.garrett@nebula.com</a>>
> Signed-off-by: Rafael J. Wysocki <<a href="mailto:rafael.j.wysocki@intel.com">rafael.j.wysocki@intel.com</a>>
>
> :040000 040000 cd4ce0b293e303c610af578ffd39c1b63decac3a
> c16757184ad041a368b13952e00e05998f3298fc M drivers</span >
If reverting that commit helps, I think we can revert it for 3.11 easily.</pre>
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