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Re: [Xen-devel] [PATCH] VT-d: add iommu=igfx_off option to workaround graphics issues


On 17/07/2015 20:05, Ting-Wei Lan wrote:
When using Linux >= 3.19 (commit 47591df) as dom0 on some Intel Ironlake
devices, It is possible to encounter graphics issues that make screen
unreadable or crash the system. It was reported in freedesktop bugzilla:


As we still cannot find a proper fix for this problem, this patch adds
iommu=igfx_off option that is similar to Linux intel_iommu=igfx_off for
users to manually workaround the problem.

I would prefer to see the introduction of intel_iommu parameter in the vtd code rather than extending again the iommu parameter with intel specific options in the common code which is both for ARM and x86.


Julien Grall

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