[Bug 76276] Backlight control broken on Dell XPS13 w/ kernel 3.14-rc7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76276

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #23 from Jani Nikula <jani.nikula at intel.com> ---
Fix pushed as

commit 1901dd794a87911d82edab57dc6f87c7fe9c9bfc
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

and

commit d76fedf1980022912508e742660cebdc27c7a010
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

These will fix the issue for 3.15 and beyond, but Daniel feels it's too risky
to backport these to 3.14. I'll leave the bug open until we've figured out what
to do with that. Possibly the safest approach would be to revert

commit bc0bb9fd1c7810407ab810d204bbaecb255fddde
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Thu Nov 14 12:14:29 2013 +0200

    drm/i915: remove QUIRK_NO_PCH_PWM_ENABLE

in 3.14 stable.

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