[Bug 99344] New: [KBL] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99344

            Bug ID: 99344
           Summary: [KBL] [drm:intel_cpu_fifo_underrun_irq_handler]
                    *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: ryabinin.a.a at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128853
  --> https://bugs.freedesktop.org/attachment.cgi?id=128853&action=edit
dmesg

This occasionally happens on resume, after display has been suspended.

I.e. I can trigger this via following commands:
     xset dpms force suspend && xset dpms force on

Sometimes screen remains black after that.
There are two errors in dmesg:
[  850.328129] [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk
change
[  850.533486] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun

Sometimes I see only the first error, but in that case display works, it
doesn't remain black. So this might be a two separate issues, I'm going to open
another bug for the first error.

dmesg with drm.debug=1e attached.

Kernel version - 4.9.2
Hardware - Dell XPS 13 9360

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