[Bug 86189] New: [BSW]igt/drv_missed_irq_hang sporadically causes *ERROR* pipe B underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86189

            Bug ID: 86189
           Summary: [BSW]igt/drv_missed_irq_hang sporadically causes
                    *ERROR* pipe B 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 109327
  --> https://bugs.freedesktop.org/attachment.cgi?id=109327&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, fail rate:1/10
Non-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/9a7620f405895714b4e0dc3181a8328b4406287e

==Bug detailed description==
It sporadically causes "<3>[  673.232605]
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* pipe B underrun" on
BSW with -nightly kernel. fail rate: 1/10.

output:
Interrupts masked
Interrupts unmasked
Cleared missed interrupts


==Reproduce steps==
---------------------------- 
1. ./drv_missed_irq_hang

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