[Bug 79813] [915] Linux v3.15 regression with bisection: Chromebook loses backlight control

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79813

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
Caused by
commit c675949ec58ca50d5a3ae3c757892f1560f6e896
Author: Jani Nikula <jani.nikula at intel.com>
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.

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