[Bug 78653] New: Backlight control broken on Dell XPS M1330 w/ kernel >= 3.14.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78653

          Priority: medium
            Bug ID: 78653
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Backlight control broken on Dell XPS M1330 w/ kernel
                    >= 3.14.1
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mikkeloscar at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 98965
  --> https://bugs.freedesktop.org/attachment.cgi?id=98965&action=edit
dmesg with drm.debug=0xe

Similar to https://bugs.freedesktop.org/show_bug.cgi?id=76276. Since kernel
3.14.1 backlight control doesn't work on Dell XPS M1330 unless I do:

# echo 255000 > /sys/class/backlight/intel_backlight

to temporarily fix it.

As requested in https://bugs.freedesktop.org/show_bug.cgi?id=76276#c41 I have
attached dmesg with drm.debug=0xe and /sys/kernel/debug/dri/0/i915_opregion. I
produced these on 3.15-rc5.

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