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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Video cutout on Kaby Lake U processors."
href="https://bugs.freedesktop.org/show_bug.cgi?id=107543#c34">Comment # 34</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Video cutout on Kaby Lake U processors."
href="https://bugs.freedesktop.org/show_bug.cgi?id=107543">bug 107543</a>
from <span class="vcard"><a class="email" href="mailto:phil.smith@adder.com" title="phil.smith@adder.com">phil.smith@adder.com</a>
</span></b>
<pre>We have seen one more occurrence of the black screen, and like the last time it
was seen on the drm-intel kernel, it recovered after a short while. This is
different to running the default Debian Stretch kernel where it does not
recover.
Now it recovers it is slightly harder to observe the error. :)
[ 1400.616629] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1422.401223] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1444.219104] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1466.037044] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1487.871609] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1509.689495] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1510.214766] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
[ 1515.438784] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe
A FIFO underrun
It is possibly a Wayland bug? We have only observed the black screen using
Wayland/Weston with windows on screen.</pre>
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