Messages in this thread | | | Date | Wed, 23 Jan 2019 17:49:59 +0100 | From | Joerg Roedel <> | Subject | Re: [PATCH] iommu/intel: quirk to disable DMAR for QM57 igfx |
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On Wed, Jan 23, 2019 at 05:02:38PM +0200, Joonas Lahtinen wrote: > We have many reports where just having intel_iommu=on (and using the > system normally, without any virtualization stuff going on) will cause > unexplained GPU hangs. For those users, simply switching to > intel_iommu=igfx_off solves the problems, and the debug often ends > there.
If you can reproduce problems on your side, then you can try to enable CONFIG_INTEL_IOMMU_BROKEN_GFX_WA to force the GFX devices into the identity mapping. We can also add a boot-parameter and workarounds if it turns out that this is sufficient to make the GFX devices work with IOMMU enabled.
Regards,
Joerg
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