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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [915] Linux v3.15 regression with bisection: Chromebook loses backlight control"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79813#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [915] Linux v3.15 regression with bisection: Chromebook loses backlight control"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79813">bug 79813</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>Caused by
commit c675949ec58ca50d5a3ae3c757892f1560f6e896
Author: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>>
Date: Wed Apr 9 11:31:37 2014 +0300
drm/i915: do not setup backlight if not available according to VBT
There are plenty of machines that have a dedicated EC for backlight control,
and break if we provide a backlight interface and touch the backlight
registers. The way to provide the information to the kernel is the VBT.</pre>
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