[Bug 91127] Graphics problems with intel_iommu=on on Linux >= 3.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91127

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Ting-Wei Lan from comment #8)
> 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]

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.

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