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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#c106">Comment # 106</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 Mauro Santos from <a href="show_bug.cgi?id=94605#c105">comment #105</a>)
<span class="quote">> Might these two patches help with screen flickering only when intel_iommu=on
> is used? (see <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="show_bug.cgi?id=94605#c79">https://bugs.freedesktop.org/show_bug.cgi?id=94605#c79</a> and
> following comments)
>
> If yes, would it be ok to test against 4.8.x or does it needs to be against
> drm-next?</span >
I suggest you to try it, just in case it does help.
If your issue really only happens with intel_iommu=0, please please open a new
bug report called something like "Skylake screen flickering only with
intel_iommu=on", and attach the relevant logs (boot with drm.debug=0xe
log_buf_len=1M, reproduce the problem, grab the dmesg output).
As a note, it's really really hard to deal with these bug reports with too many
people describing similar-but-still-different symptoms. I'd really rather have
100 separate bug reports than a bug with 100 different people saying "me too".
Thanks everybody for the help!</pre>
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