[Bug 94898] New: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94898

            Bug ID: 94898
           Summary: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
                    *ERROR* CPU pipe B FIFO underrun
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: garrettn at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122868
  --> https://bugs.freedesktop.org/attachment.cgi?id=122868&action=edit
Full Dmesg with debug (a lockup occured at 11:02AM-ish)

I running Manjaro (Arch based) (4.4.6-1 kernel) on a Dell XPS 13" (9343) with
an external displayport (v1.2) 4K at 60Hz monitor.

I'm getting several hard lockups per day but this only occurs when I use an
external 4K monitor through the display port (i.e. internal laptop display is
100% stable)

I've turned on drm.debug=14 to try to see what is going on, but I do not catch
anything on the hard lockups.  

I get quite a bit of display flickering and see these messages in my logs
frequently:

Apr 08 12:13:44 station kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun
Apr 09 09:49:56 station kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun
Apr 09 20:55:13 station kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun
Apr 10 16:02:29 station kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun
Apr 11 07:40:40 station kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun
Apr 11 10:12:11 station kernel: [drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun

Eventually, my machine hard locks right while I'm using it.

I've tried different kernel versions and also set i915.enable_ips=0. I've also
tried different 4K monitors and also swapped out my displayport cable.

I'm attaching some files:
* Full dmesg with drm.debug=14 from boot (one lockup occurred at 11:03AM)
* xrandr --verbose
* Xorg.log
* /sys/class/drm/card0/error contains "no error state collected"

Appreciate any ideas.

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