[Intel-gfx] Screen extremely dim on Dell Latitude D630 after upgrading to Linux kernel-3.14

[Marc Milgram]

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 at intel.com  <mailto:jani.nikula at 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 at intel.com  <mailto:jani.nikula at intel.com>>
     Reviewed-by: Imre Deak <imre.deak at intel.com  <mailto:imre.deak at intel.com>>
     Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch  <mailto:daniel.vetter at 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

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