[Bug 86233] New: [HSW regression] PCH transcoder A FIFO underrun while hot-plug VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86233

            Bug ID: 86233
           Summary: [HSW regression] PCH transcoder A FIFO underrun while
                    hot-plug VGA
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisect_pending
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: li.l.xu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 109385
  --> https://bugs.freedesktop.org/attachment.cgi?id=109385&action=edit
dmesg

Environment:
--------------------------
Platform: Haswell
Kernel: (drm-intel-nightly) 2014_11_13 22ba72f728eaf30e63ded0c0bb0484b4bc6f92d4

Bug detailed description:
-----------------------------
When boot up ,and then plug in VGA ,error messages show as follows:

*ERROR* uncleared pch fifo underrun on pch transcoder A
*ERROR* PCH transcoder A FIFO underrun
*ERROR* uncleared fifo underrun on pipe B
*ERROR* CPU pipe B FIFO underrun



Steps:
---------------------------
Boot up
plug in VGA

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