[Bug 90896] 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=90896

            Bug ID: 90896
           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: fraph24 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116363
  --> https://bugs.freedesktop.org/attachment.cgi?id=116363&action=edit
journalctl -k -t kernel > intel_cpu_fifo_underrun_irq_handler-kernel.txt

It happens when switching back from VT to X after a couple of seconds of
flickering.

It was found while investigating on:
https://bugs.freedesktop.org/show_bug.cgi?id=88944

$ cat /proc/cmdline 
BOOT_IMAGE=/vmlinuz-4.0.4-303.fc22.x86_64
root=UUID=6d95a3dd-0830-4bf9-94c1-a37232327df9 ro rootflags=subvol=root
rd.luks.uuid=luks-81064417-7468-43b9-8e39-2e5e9e332d40
rd.luks.uuid=luks-87e2654d-afaa-402c-a4a7-1d6aa1e2403b rhgb quiet
systemd.log_level=debug systemd.log_target=kmsg log_buf_len=1M drm.debug=0xe

$ uname -a
Linux winston 4.0.4-303.fc22.x86_64 #1 SMP Thu May 28 12:37:06 UTC 2015 x86_64
x86_64 x86_64 GNU/Linux

$ cat /etc/system-release
Fedora release 22 (Twenty Two)

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