[Bug 101012] New: Sporadic FIFO underruns [ILK]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101012

            Bug ID: 101012
           Summary: Sporadic FIFO underruns [ILK]
           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: linuxhippy at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Running Fedora-25 (linux-4.10.14, Mesa-17.0.5, Glamor) on my Ironlake/Arrandale
based Laptop, I get the following messages in syslog along with a flickering
screen:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
[drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO
underrun

Also, I have seen the system hang at least one time when it actually should
modeswitch.

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