[Bug 101868] New: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101868

            Bug ID: 101868
           Summary: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
                    *ERROR* CPU pipe A FIFO underrun
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sven.koehler at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On my Dell XPS 9560 with an Intel Core i7 7700HQ, the display is flickering
occasionally. When the flickering occurs, the following message appears in
dmesg:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun


If I work on Windows (which I rarely do), the flickering is absent. When I work
with Linux, it appears a few times a day.

I believe I have the most current DMC firmware installed:
[drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin (v1.1)


The flickering seems to happen especially often, if the laptop is running on
battery.


I am using enable_rc6=0 right now, and it seems the problem with the FIFO
underrun disappeared. No more display flickering.

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