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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] Flashing black screen ([drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94605#c104">Comment # 104</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] Flashing black screen ([drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94605">bug 94605</a>
from <span class="vcard"><a class="email" href="mailto:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> <span class="fn">Paulo Zanoni</span></a>
</span></b>
<pre>(In reply to Dominik Klementowski from <a href="show_bug.cgi?id=94605#c101">comment #101</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=128413" name="attach_128413" title="dmesg">attachment 128413</a> <a href="attachment.cgi?id=128413&action=edit" title="dmesg">[details]</a></span>
> dmesg
>
> I'm sorry for the late answer as I was busy.
> Yes I forgot to add parameter to make log buffer bigger.
> Attachment contains dmesg messages, current intel-drm-nightly is used and
> kernel was loaded with params:
> drm.debug=0xe log_buf_len=2M i915.enable_rc6=1
>
> Uptime says system was loaded 15 minutes ago and I saw black blink only once
> so not that bad at all.</span >
Thanks a lot for this! While looking at the log files I spotted one thing about
your machine that's different from my machine (where I can't reproduce the
problem), so I decided to investigate and found one possible issue. Can you
please test whether the two patches I attached fix the problem?
Just apply both patches, then test. If the problem goes away, it would be good
to revert patch 2 and test to see if the problem also goes away with just patch
1 applied.
Thanks a lot for the help!</pre>
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