[Bug 81903] New: [BDW Regression] DP Hot plug cause DP monitor can't be lighted up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81903

          Priority: medium
            Bug ID: 81903
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression] DP Hot plug cause DP monitor can't be
                    lighted up
        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 103672
  --> https://bugs.freedesktop.org/attachment.cgi?id=103672&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==
-----------------------------
DP Hot plug cause DP monitor can't be lighted up.

==Reproduce steps==
---------------------------- 
1.  unplug DP 
2.  plugin DP
3.  check DP monitor

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