[Bug 87736] New: [BDW] Hot unplug VGA EFP from docking then plug in, find EFP cannot be detected anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87736

            Bug ID: 87736
           Summary: [BDW] Hot unplug VGA EFP from docking then plug in,
                    find EFP cannot be detected anymore
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: phidias.chiang at canonical.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111357
  --> https://bugs.freedesktop.org/attachment.cgi?id=111357&action=edit
error message when unplugging VGA cable in 3.13.0-34 kernel

[Summary]
Hot unplug VGA EFP from docking then plug in, find EFP cannot be detected any
more.

[Steps]
1. Boot up the system with docking
2. Plug the VGA port
3. Fn+F4 to trigger the external monitor display
4. Unplug the VGA port and replug again
5. Check the external monitor

[Expected results]
1. External monitor still can display.

[Actual results]
1. External monitor can't display.

[linux-3.13.0-34-generic]
After unplugging VGA and replugging back, system is blocked
when executing `cat /sys/class/drm/card0-DP-2/status`.
Test with Fn+F4 or running `xrandr` at the moment system hangs.

[linux-3.13.0-38]
After detaching DP and connection VGA,
it probes and outputs to external monitor correctly,
but if unplug VGA and replug again it failed
(disconnected in /sys/class/drm/card0-DP-2/status)

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