[Bug 111726] New: [WHL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111726

            Bug ID: 111726
           Summary: [WHL] [drm:intel_cpu_fifo_underrun_irq_handler]
                    *ERROR* CPU pipe B FIFO underrun
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: other
            Status: NEW
          Severity: major
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sushma.venkatesh.reddy at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145408
  --> https://bugs.freedesktop.org/attachment.cgi?id=145408&action=edit
dmesg for FIFO underruns in PIPE B

The issue is reproducible on Chrome OS WHL device when we connect a 4K external
monitor to DUT. I was able to reproduce quite often using LG model 27UD88-W.

Attaching the log where I could reproduce the issue even on drm-tip.

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