[Bug 94605] Flashing black screen ([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=94605

--- Comment #7 from shdownnine at gmail.com ---
I have a same issue on Asus X751M laptop with Linux kernels 4.5.0 and 4.6-rc6
(is using this one an equivalent of using drm-intel-nightly?), but the screen
just goes black and only goes unblack when I move a mouse connected to the
laptop or touch a touchpad. It is not a usual power-saving thing, since it
usually occurs when I switch between workspaces (I use i3wm). With Linux 4.5.0,
a reliable way to reproduce this 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 goes black. With 4.6-rc6 kernel the script does not
cause this behavior, and it generally occurs rarer, but still does.

When it goes black for the first time in the session, the following line
appears in dmesg:

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

The same thing (the black screen, not the line) happens when I run

    xset dpms force off

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

I haven't faced this behavior using the 4.4.0 kernel, but all Linux kernels I
tried at some moment just hang up on this laptop. I don't know if it is
related.

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