[Bug 95367] New: Screen suddenly goes black, [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95367

            Bug ID: 95367
           Summary: Screen suddenly goes black,
                    [drm:valleyview_pipestat_irq_handler [i915]] *ERROR*
                    CPU pipe A FIFO underrun
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: shdownnine at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123650
  --> https://bugs.freedesktop.org/attachment.cgi?id=123650&action=edit
dmesg after the black screen, when is not preceded by another *ERROR* message

I have the following issue on my Asus X751MJ laptop, with Linux kernels 4.5.0,
4.5.1 and 4.6-rc6 (does not happen on 4.4.0): at random moments the screen goes
black (that is, the backlight gets turned off) and only goes unblack when I
move a mouse attached to the laptop or touch the touchpad; this is not a usual
pover-saving thing because it usually occurs when I switch between workspaces
(I use i3wm). With 4.5.0 and 4.5.1 kernels a reliable way to reproduce it is to
open two workspaces and run

    while true; do i3-msg workspace back_and_forth >/dev/null; done

In a few seconds the screen will go black; with 4.6-rc6 kernel the script does
not reproduce the issue, and it generally occurs rarer, but still does.

The same thing happens if I run

    xset dpms force off

(but in this case it also goes unblack if I press a key).

When it goes black at the first time after the boot or a suspend, the following
lines appear in dmesg:

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

Sometimes it is preceded by the following line:

[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* pipe A underrun

The laptop has hybrid graphics, and Intel card plus an NVIDIA one. Initially
nouveau was installed, then I tried installing the proprietary NVIDIA driver,
but that did not help. Now I removed it, configured X11 to use the Intel card
only and even blacklisted the nouveau module, but I didn't help either.

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