After upgrading to linux Kernel-3.14, the screen on my Dell Latitude D630 was nearly unreadably dim. When I Boot the 3.13 kernel, my screen is bright.

I opened a Bug here: https://bugzilla.redhat.com/show_bug.cgi?id=1094066 and others have chimed in that they have the same problem.

I bisected the kernel, and found the following commit is responsible for this problem:

b35684b8fa94e04f55fd38bf672b737741d2f9e2 is the first bad commit
commit b35684b8fa94e04f55fd38bf672b737741d2f9e2
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Thu Nov 14 12:13:41 2013 +0200

    drm/i915: do full backlight setup at enable time
    
    We should now have all the information we need to do a full
    initialization of the backlight registers.
    
    v2: Keep QUIRK_NO_PCH_PWM_ENABLE for now (Imre).
    
    Signed-off-by: Jani Nikula <jani.nikula@intel.com>
    Reviewed-by: Imre Deak <imre.deak@intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

:040000 040000 0aae5515ca62ff1bfd2e1c2769e30c58b016ffeb 01c2f8cd145f8cf29730908d52e7e89b787a059e M	drivers

I can find my way around the kernel, but haven't hit this area before.

Any help is appreciated.

Marc Milgram