[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 #38 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #23)
> 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.

While we have this covered now in upstream, I've submitted the revert to 3.14
stable [1]. Let's see what the stable team says.

[1]
http://mid.gmane.org/b6e9694e03367a3133511f7093c917b4982f1266.1398678778.git.jani.nikula@intel.com

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