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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB/HSW]igt/kms_flip subcases sporadically cause *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85898#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB/HSW]igt/kms_flip subcases sporadically cause *ERROR* uncleared pch fifo underrun on pch transcoder A"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85898">bug 85898</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>(In reply to Daniel Vetter from <a href="show_bug.cgi?id=85898#c3">comment #3</a>)
<span class="quote">> I wonder whether we should tune down underrun warnings on the PCH, seems to
> happen why too often in random circumstances ...</span >
IIRC I saw something like this on my IVB, but only with the non-existing VGA
connector. I didn't post the patch since I couldn't be sure if it was just
specific to that machine. As I recall, the cure involved rearranging the PCH
underrun reporting disable/enable points a bit. I can see if I can still
reproduce it here and maybe resurrect that patch, or recreate it if I can't
find it anymore.</pre>
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