[Bug 79423] New: Screen extemely dim on Dell Latitude D630

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79423

          Priority: medium
            Bug ID: 79423
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Screen extemely dim on Dell Latitude D630
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mmilgram at redhat.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Previously reported against Fedora here:
https://bugzilla.redhat.com/show_bug.cgi?id=1094066

It seems that the backligt goes dim when the laptop boots.

I bisected the kernel, and found that the issue started with the following
commit:
b35684b8fa94e04f55fd38bf672b737741d2f9e2 is the first bad commit
commit b35684b8fa94e04f55fd38bf672b737741d2f9e2
Author: Jani Nikula <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>
    Reviewed-by: Imre Deak <imre.deak at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 0aae5515ca62ff1bfd2e1c2769e30c58b016ffeb
01c2f8cd145f8cf29730908d52e7e89b787a059e M    drivers

I tested with the latest 3.15-rc kernel (as of 2 nights ago), and it has the
same problem.

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