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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [snb] External DP monitor goes black during heavy display activity"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59824#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [snb] External DP monitor goes black during heavy display activity"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59824">bug 59824</a>
from <span class="vcard"><a class="email" href="mailto:jadamcze@utas.edu.au" title="Jonathan Adamczewski <jadamcze@utas.edu.au>"> <span class="fn">Jonathan Adamczewski</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=59824#c13">comment #13</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=59824#c12">comment #12</a>)
> > Tested with drm-intel-nightly 06653b7 and experienced the same problem.
>
> Can you please boot with drm.debug=0xe and check whether you see any "FIFO
> underrun" reports?</span >
Playing 4k youtube video, the screen went back and this was logged :
[drm:ilk_display_irq_handler], Pipe B FIFO underrun
[drm:cpt_serr_int_handler], PCH transcoder B FIFO underrun</pre>
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