[Bug 67462] New: [SNB] Call trace appears after system boots with DP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67462

          Priority: medium
            Bug ID: 67462
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB] Call trace appears after system boots with DP
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 83189
  --> https://bugs.freedesktop.org/attachment.cgi?id=83189&action=edit
call trace dmesg

System Environment:
--------------------------------------------
Kernel: (drm-intel-next-queued)fae5cbff3e3e4097de2e76178d462b90626c2bdb
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Sun Jul 21 21:37:09 2013 +0200

    drm/i915: clean up crtc timings computation

Bug detailed description:
--------------------------------------------
Call trace appears after system boots with DP pipe. In boot dmesg, which I will
attach in the attachment, you can see two call trace. The first call trace can
reproduce every time, but the second call trace appears sporadically. The dmesg
I grabbed happened to has the second call trace.

Reproduce steps:
--------------------------------------------
1. boot system with DP plugged in
2. grab dmesg

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