[Bug 113811] New: Screen is too dark with i915

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=113811

            Bug ID: 113811
           Summary: Screen is too dark with i915
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.4
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: kapsh at kap.sh
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 207761
  --> https://bugzilla.kernel.org/attachment.cgi?id=207761&action=edit
EDID as reported by read-edid

Maybe it sounds strange but after updating to kernel 4.4.4 I encountered with
some problem: my screen became too dark and looks like "high contrast". I can't
say surely that it is not my PC problem but everything works normal on 4.4.3.

Searching with git bisect reports that first bad commit is:
[6de4682d2845d6aa8883ae62e3ed1b2f915df4e8] drm/i915/dp: fall back to 18 bpp
when sink capability is unknown

Hardware details. 
Monitor: LG "23MP67D" connected to Display port. 
Processor: Intel(R) Core(TM) i5-6600

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