[Bug 81890] New: [BDW Regression]One DP monitor was recognized as two DP monitors by mistake.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81890

          Priority: medium
            Bug ID: 81890
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression]One DP monitor was recognized as two
                    DP monitors  by mistake.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 103662
  --> https://bugs.freedesktop.org/attachment.cgi?id=103662&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes

Good commit on drm-next: 008f40451d0e59f220a4fa13aaf75d04303a01a1

Non-working platforms: BDW 

==kernel==
--------------------------
origin/drm-intel-nightly: 8734408c113bb38234ed03ec51c723b3deff579b(fails)
    drm-intel-nightly: 2014y-07m-18d-15h-21m-24s integration manifest
origin/drm-intel-next-queued: 34548e510657af829032f23128c0c01ebe48ef21(works)
    drm/i915: Do not unmap object unless no other VMAs reference it  
origin/drm-intel-fixes: c6930992948adf0f8fc1f6ff1da51c5002a2cf95(works)
    Revert "drm/i915: reverse dp link param selection, prefer fast over wide
again"

origin/drm-fixes: 3c169e5629d6bce9aede3907aeb38f1c23f61952(works)
    Merge branch 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux
into drm-fixes
origin/drm-next:b957f457fbce30cc4901dc28f2b56f2b15dfe84a(fails)
    drm/radeon: use helpers

==Bug detailed description==
-----------------------------
One DP monitor was recognized as two DP monitors  by mistake.
Output :
[root at x-bdw01 ~]# xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 282mm x
165mm
   1920x1080     60.00*+
   1400x1050     59.98
   1280x1024     60.02
   1280x960      60.00
   1024x768      60.00
   800x600       60.32    56.25
   640x480       59.94
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP2 connected (normal left inverted right x axis y axis)
   1920x2160     59.99 +
DP3 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 698mm x
392mm
   1920x2160     59.99 +
   1920x1200     59.88
   1920x1080     59.99*
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     75.02    60.02
   1280x800      59.81
   1152x864      75.00
   1024x768      75.08    60.00
   800x600       75.00    60.32
   640x480       75.00    60.00
   720x400       70.08
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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