[Bug 89360] [bdw-u iommu] DMAR error -> GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

--- Comment #47 from Mads <mads at ab3.no> ---
(In reply to Mads from comment #45)
> (In reply to klondike from comment #44)
> > 
> > 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.

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, bug 97211

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