[Bug 85898] New: [IVB]igt/kms_flip/wf_vblank-interruptible sporadically causes *ERROR* uncleared pch fifo underrun on pch transcoder A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85898

            Bug ID: 85898
           Summary: [IVB]igt/kms_flip/wf_vblank-interruptible sporadically
                    causes *ERROR* uncleared pch fifo underrun on pch
                    transcoder A
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108932
  --> https://bugs.freedesktop.org/attachment.cgi?id=108932&action=edit
dmesg

==System Environment==
--------------------------
Regression:  not sure

Non-working platforms: IVB

==kernel==
--------------------------
drm-intel-nightly/f56717bdf29eb7d6a9ec15f095ea2a6858895473

==Bug detailed description==
It sporadically causes "*ERROR* uncleared pch fifo underrun on pch transcoder
A", fail rate: 3/5

output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Using monotonic timestamps
Beginning wf_vblank-interruptible on crtc 8, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
............................................................
wf_vblank-interruptible on crtc 8, connector 18: PASSED

Beginning wf_vblank-interruptible on crtc 12, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
............................................................
wf_vblank-interruptible on crtc 12, connector 18: PASSED

Beginning wf_vblank-interruptible on crtc 16, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
............................................................
wf_vblank-interruptible on crtc 16, connector 18: PASSED

Subtest wf_vblank-interruptible: SUCCESS (30.349s)

==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest wf_vblank-interruptible

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