[Bug 102373] New: [CI][SNB] *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102373

            Bug ID: 102373
           Summary: [CI][SNB] *ERROR* CPU pipe B FIFO underrun
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On Sandybridge, we see CPU pipe B FIFO underruns when running the following
tests:
 - igt at kms_flip@plain-flip-ts-check-interruptible
 - igt at kms_flip@dpms-vs-vblank-race
 - igt at kms_cursor_crc@cursor-128x128-random

[   73.318726] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[   73.318873] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder B
[   73.318912] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder B FIFO underrun

Full logs:
-
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2994/shard-snb6/igt@kms_flip@plain-flip-ts-check-interruptible.html
-
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2992/shard-snb1/igt@kms_flip@dpms-vs-vblank-race.html
-
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2994/shard-snb5/igt@kms_cursor_crc@cursor-128x128-random.html

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