[Bug 71905] New: [SNB]DP hotplug Calltrace shows Warning:Workqueue: events i915_hotplug_work_func [i915] ironlake_crtc_disable+0x54/0x73a

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71905

          Priority: medium
            Bug ID: 71905
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB]DP hotplug Calltrace shows Warning:Workqueue:
                    events i915_hotplug_work_func [i915]
                    ironlake_crtc_disable+0x54/0x73a
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: qingshuai.tian at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 89617
  --> https://bugs.freedesktop.org/attachment.cgi?id=89617&action=edit
dmesg of DP hotplug Calltrace

Environment:
------------------------
Kernel: (drm-intel-next-queued)f671d117bc0338b67b0a7485882d332fe6c4b570
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Sat Nov 16 16:02:04 2013 +0100

    drm/i915: remove intel_uncore_clear_errors

Description:
------------------------
After the machine boot up with DP monitor, I pulled out the DP monitor's
plug.Then I see there is Calltrace displayed on the monitor.
You can check the Calltrace in the attachment.

When I trace back to the drm-intel-next-queued kernel of June, the Calltrace
are still reproducable. It's hard to find a good point. If need bisect, ping
me. 

Reproduce steps:
----------------
1.Plug in DP monitor
2.Boot up the computer
3.Unplug the DP monitor

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