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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB CPU eDP] local flat panel stays blank, workaround: intel_iommu=igfx_off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48652#c114">Comment # 114</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB CPU eDP] local flat panel stays blank, workaround: intel_iommu=igfx_off"
href="https://bugs.freedesktop.org/show_bug.cgi?id=48652">bug 48652</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@gmail.com" title="Imre Deak <imre.deak@gmail.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=82344" name="attach_82344" title="disable sg compaction">attachment 82344</a> <a href="attachment.cgi?id=82344&action=edit" title="disable sg compaction">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=48652&attachment=82344'>[review]</a>
disable sg compaction
<span class="quote">> (In reply to <a href="show_bug.cgi?id=48652#c111">comment #111</a>)
> > yes, intel_iommu=igfx_off helps too. Thanks!
>
> Ok, that's proof that something _really_ fishy is going on here. Big WTF
> moment ... Imre do you have any ideas what this could be? Seen anything like
> this when you've done the sg conversion?</span >
No, I haven't tested vt-d ... But yeah, it may be similar to the swiotlb
limitation. Oleksij could you try if the attached patch fixes the problem? I
can take a closer look tomorrow.</pre>
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