[Bug 48652] [IVB CPU eDP] local flat panel stays blank, workaround: intel_iommu=igfx_off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48652

--- Comment #114 from Imre Deak <imre.deak at gmail.com> ---
Created attachment 82344
  --> https://bugs.freedesktop.org/attachment.cgi?id=82344&action=edit
disable sg compaction

> (In reply to comment #111)
> > 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?

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.

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