[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #32 from phil.smith at adder.com ---
https://cgit.freedesktop.org/drm-intel/

commit 448626103dad54ec5d06722e955586b5d557625d
Author: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Date:   Fri Sep 21 12:26:37 2018 +0300

    drm/i915: Update DRIVER_DATE to 20180921

    Signed-off-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

We have built and installed a kernel using the above source. We are running a
.config which is pretty much the same as Debian Stretch's default .config.

On top of this is Debian Stretch running Wayland. We started a few terminals
and a (high CPU load) software video decode.

After this was running for ~20 minutes we turned the monitor on and off a few
times and observed a CPU pipe A FIFO underrun. The screen turned black and
stayed that way for a few minutes before a further burst of CPU pipe A FIFO
underrun saw the screen recover.

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