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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Graphics problems with intel_iommu=on on Linux >= 3.7"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91127#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Graphics problems with intel_iommu=on on Linux >= 3.7"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91127">bug 91127</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to Ting-Wei Lan from <a href="show_bug.cgi?id=91127#c8">comment #8</a>)
<span class="quote">> My system hangs and I have to press the reset button to reboot it now.
>
> Serial console log:
>
> [ 2711.310268] Kernel panic - not syncing: DMAR hardware is malfunctioning
> [ 2711.310268]</span >
That panic is caused by the iommu not responding to the TLB flush. You're
better chasing the iommu experts as to what the likely cause is and whether it
is addressable.</pre>
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