[Bug 88859] New: [BSW]igt/kms_rotation_crc/cursor-rotation sporadically timeout and causes *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88859

            Bug ID: 88859
           Summary: [BSW]igt/kms_rotation_crc/cursor-rotation sporadically
                    timeout and causes *ERROR* CPU pipe B FIFO underrun
           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 112930
  --> https://bugs.freedesktop.org/attachment.cgi?id=112930&action=edit
dmesg

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

Non-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/70438b51bdd44180b83f10591c3bdc1832d11dc2
commit 70438b51bdd44180b83f10591c3bdc1832d11dc2
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Jan 27 12:11:03 2015 +0100

    drm-intel-nightly: 2015y-01m-27d-11h-10m-41s UTC integration manifest

==Bug detailed description==
-----------------------------
Run 5 cycles on BSW with the latest -nightly kernel. fail rate: 2/5, it also
has bug 86767 
It also has following error:
<3>[ 2768.795405] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun

IGT-Version: 1.9-g7848d21 (x86_64) (Linux:
3.19.0-rc6_drm-intel-nightly_70438b_20150128+ x86_64)
Subtest cursor-rotation: TIMEOUT (13.084s)

==Reproduce steps==
---------------------------- 
./kms_rotation_crc --run-subtest cursor-rotation

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