[Bug 84083] New: [BDW Regression]DP unable to light up after unplug/plug while X running

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84083

          Priority: high
            Bug ID: 84083
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression]DP unable to light up after
                    unplug/plug while X running
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 106537
  --> https://bugs.freedesktop.org/attachment.cgi?id=106537&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Good commit on -next-queued: 1cf0ba14740d96fbf6f58a201f000a34b74f4725

Non-working platforms: BDW

==kernel==
--------------------------
origin/drm-intel-nightly:3d788a0e87efd99553d5b00a70ab2a162c2c2283(fails)
    drm-intel-nightly: 2014y-09m-18d-14h-51m-54s UTC integration manifest
origin/drm-intel-next-queued:f2a95be39ef661595379c23964710f0d760a2385(fails)
    drm/i915/vlv: Remove check for Old Ack during forcewake
origin/drm-intel-fixes: 8c875fca1a8d76665c60fa141c220cee65f44f5e(works)
    drm/i915: Add limited color range readout for HDMI/DP ports on g4x/vlv/chv


==Bug detailed description==
-----------------------------
Start X, then unplug/plug DP, the DP monitor unable to light up. It works well
if don't start X. 

Hardware Environment:
root at x-bdw09:~# lspci -nnn
00:00.0 Host bridge [0600]: Intel Corporation Broadwell-U Host Bridge -OPI
[8086:1604] (rev 09)
00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U
Integrated Graphics [8086:1616] (rev 09)
00:03.0 Audio device [0403]: Intel Corporation Broadwell-U Audio Controller
[8086:160c] (rev 09)
00:14.0 USB controller [0c03]: Intel Corporation Wildcat Point-LP USB xHCI
Controller [8086:9cb1] (rev 03)
00:16.0 Communication controller [0780]: Intel Corporation Wildcat Point-LP MEI
Controller #1 [8086:9cba] (rev 03)
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection (3)
I218-LM [8086:15a2] (rev 03)
00:1f.0 ISA bridge [0601]: Intel Corporation Wildcat Point-LP LPC Controller
[8086:9cc3] (rev 03)
00:1f.2 SATA controller [0106]: Intel Corporation Wildcat Point-LP SATA
Controller [AHCI Mode] [8086:9c83] (rev 03)
00:1f.3 SMBus [0c05]: Intel Corporation Wildcat Point-LP SMBus Controller
[8086:9ca2] (rev 03)
00:1f.6 Signal processing controller [1180]: Intel Corporation Wildcat Point-LP
Thermal Management Controller [8086:9ca4] (rev 03)

==Reproduce steps==
---------------------------- 
1. Plug DP monitor
2. xinit &
3. Unplug DP cable then plug it

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