In linus/master:
commit 5c0422878fcdc279ae9a8e8b66972a15b5efb67f
Author: Ben Widawsky <[email protected]>
Date: Mon Oct 17 15:51:55 2011 -0700
drm/i915: ILK + VT-d workaround
Idle the GPU before doing any unmaps. We know if VT-d is in use through
an exported variable from iommu code.
This should avoid a known HW issue.
Signed-off-by: Ben Widawsky <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Keith Packard <[email protected]>
This does introduce a synchronous flush of the iommu tlb everytime a
buffer is released which can cause stalls of ~1s every few seconds...
But it does prevent the eventual machine hang. However, I would advise
you to continue to use intel_iommu=igfx_off unless you truly do require
virtualised graphics.
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https://bugs.launchpad.net/bugs/911236
Title:
DMAR:[fault reason 05] PTE Write access is not set
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