<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [bdw-u iommu] DMAR error -> GPU hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89360#c47">Comment # 47</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [bdw-u iommu] DMAR error -> GPU hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89360">bug 89360</a>
from <span class="vcard"><a class="email" href="mailto:mads@ab3.no" title="Mads <mads@ab3.no>"> <span class="fn">Mads</span></a>
</span></b>
<pre>(In reply to Mads from <a href="show_bug.cgi?id=89360#c45">comment #45</a>)
<span class="quote">> (In reply to klondike from <a href="show_bug.cgi?id=89360#c44">comment #44</a>)
> >
> > For me disabling the EFI framebuffer solved the issue so far so maybe other
> > reporters may want to test and see if that solves the issue for them too.
>
> I've neither had efifb nor fbsimple enabled on my XPS 15 9550, but I didn't
> get rid of this problem until I added "intel_iommu=igfx_off" to my bootargs.</span >
I failed to mention that I didn't come across this bug until trying some
drm-intel-nightly based on 4.9.0, but efifb was never involved.
intel_iommu=igfx_off also solved a long standing bug with suspend on my
machine, <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Dell XPS 15 9550 w/HD Graphics 530 - screen wont turn on when resuming from suspend"
href="show_bug.cgi?id=97211">bug 97211</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>