[Bug 102675] New: [BDW] *ERROR* CPU pipe A|B|C FIFO underrun - Regression - Bisected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102675

            Bug ID: 102675
           Summary: [BDW] *ERROR* CPU pipe A|B|C FIFO underrun -
                    Regression - Bisected
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: marta.lofstedt at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After patchset 
https://patchwork.freedesktop.org/series/29538/

I am getting a lot of FIFO underruns on my BDW NUCi5. This can start during
boot up, but if not it is 100% reproducible with
igt at kms_cursor_crc@cursor-256x256-random.

Also, this appear to be reproduced on the snb-shards from CI_DRM_3061, when
this patch-set was merged. For example igt at kms_cursor_crc@cursor-256x256-random
and igt at kms_cursor_crc@cursor-256x256-onscreen, stop flip-flopping and started
to always dmesg-warn on FIFO underrun- I.e. BUG 102373 is at least partially
duplicate to this issue.

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