[Bug 102371] New: [CI][SNB] CPU pipe A FIFO underrun in igt at kms_busy@extended-modeset-hang-newfb*

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102371

            Bug ID: 102371
           Summary: [CI][SNB] CPU pipe A FIFO underrun in
                    igt at kms_busy@extended-modeset-hang-newfb*
           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

When running the igt at kms_busy@extended-modeset-hang-newfb* tests on Sandybrige,
we consistently hit the following issue:

[   49.763465] i915 0000:00:02.0: Resetting chip after gpu hang
[   60.894990] asynchronous wait on fence i915:[global]:201 timed out
[   60.933406] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[   60.933613] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR*
uncleared pch fifo underrun on pch transcoder B
[   60.933648] [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_2993/shard-snb6/igt@kms_busy@extended-modeset-hang-newfb-with-reset-render-A.html
 -
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2993/shard-snb5/igt@kms_busy@extended-modeset-hang-newfb-with-reset-render-B.html
 -
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2993/shard-snb4/igt@kms_busy@extended-modeset-hang-newfb-render-A.html
 -
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2993/shard-snb5/igt@kms_busy@extended-modeset-hang-newfb-render-B.html

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