[Bug 84899] New: [BYT]DP hotplug doesn't work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84899

            Bug ID: 84899
           Summary: [BYT]DP hotplug doesn't work
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: xunx.fang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 107699
  --> https://bugs.freedesktop.org/attachment.cgi?id=107699&action=edit
dmesg file

==System Environment==
--------------------------
Regression: Not sure.
We will further investigate it later. 

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: ea4bec8e96ea8b33b49a7892c1c7f20041a56da6(fails)
    drm-intel-nightly: 2014y-10m-09d-07h-58m-45s UTC integration manifest
origin/drm-intel-next-queued: a128efeaa64609a9672b51bb37bb703e1b0f0128(fails)
    drm/i915: Suppress no action noise from oom shrinker
origin/drm-intel-fixes: bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9(fails)
    Linux 3.17

==Bug detailed description==
Start system with eDP, then plug DP, DP monitor unable to light up.
If start system with DP, DP hotplug works.


==Reproduce steps==
---------------------------- 
1. Boot with edp
2. plug DP

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