[Bug 77451] No backlight on DELL XPS13 after upgrade from 3.14.4 to 3.14.5

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=77451

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
For posterity:

Presumed broken in 3.14.5 by

commit e4b2de2daa7c854b661d59196ce4ff996b948ecd
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Mon Apr 28 13:10:07 2014 +0300

    drm/i915: restore QUIRK_NO_PCH_PWM_ENABLE

which fixes an earlier regression (so we can't revert that).

Presumed fixed in 3.15-rc2 by

commit 39fbc9c8f6765959b55e0b127dd5c57df5a47d67
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Wed Apr 9 11:22:06 2014 +0300

    drm/i915: check VBT for supported backlight type

and

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

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