[Bug 98503] 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=98503

            Bug ID: 98503
           Summary: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
                    *ERROR* CPU pipe A 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: gentoo at gishpuppy.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127625
  --> https://bugs.freedesktop.org/attachment.cgi?id=127625&action=edit
dmesg with drm.debug=0x1e

System architecture: x86_64
Kernel version: 4.9.0-rc2+ (drm-intel-nightly, latest checkout (commit
bbb625b))
Linux distribution: Gentoo Linux
Machine: Acer TravelMate B116-M-P16S
Processor: Intel Pentium N3700
Display connector: HDMI

I have connected an external monitor to my laptop using HDMI, internal LCD is
disabled. I am using the default settings that the screen is disabled after
some time of inactivity. Sometimes, when I press a key or move the mouse to
turn back on the screen, I only see a white screen (sometimes a different
color, but mostly white). Starting programs using a keyboard shortcut does not
help to get back the desktop.
My workaround is to call a script using a keyboard shortcut that turns off HDMI
output (xrandr --output HDMI1 --off) and enables the internal LCD (xrandr
--output eDP1 --auto --primary). After that I call a different script that
turns off the internal LCD and switches back to HDMI output. Sometimes I have
to call the scripts multiple times until I can resume work.
If the problem happens the kernel log shows:

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

I have attached the dmesg output with drm.debug=0x1e.

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