[Bug 59792] [ilk] missed irq

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59792

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
The performance issue on 3.7 is not due to the missed irq, but a combination of
using UXA and VT-d. In order to workaround an erratum on Ironlake, every time
we touch the GPU's page tables, we have to idle the GPU before doing so. This
causes extremely noticeable display lag.

Try appending intel_iommu=off to you kernel commandline.

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