[Bug 104146] New: [IGT] igt@* -dmesg-warn *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104146

            Bug ID: 104146
           Summary: [IGT] igt@* -dmesg-warn *ERROR* CPU pipe A FIFO
                    underrun
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: elizabethx.de.la.torre.mena at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 136010
  --> https://bugs.freedesktop.org/attachment.cgi?id=136010&action=edit
kern_log_from_cycle

In CNL we're getting this message in our FF tests.
[  309.667455] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
It have been appearing at least a couple of time in the dmesg by cycle, and
though the system capture the warns while executing a specific test, it don't
seems to be triggered by that test, since repeating the test various times
won't give it. 

Some of the test that have seen the messages at least once over the week: 

igt at gem_exec_flush@basic-wb-prw-default - commit-1a0d67e
igt at gem_sync@basic-each - commit-1a0d67e
igt at gem_exec_create@basic -commit-807db75
igt at gem_exec_flush@basic-uc-ro-default -commit-0d0fe91
igt at gem_exec_flush@basic-batch-kernel-default-uc -commit-0645c6d
igt at gem_exec_flush@basic-uc-set-default -commit-6d6c48b
igt at gem_sync@basic-all - -commit-807db75

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