Re: [Regression] Amd-Vi + ivrs_ioapic cause kernel oops (4.4, 4.7 fail 3.9 works)

[sunnydrake]

after applying patch " [PATCH] iommu/amd: Fix unity mapping 
initialization 
race<https://lists.linuxfoundation.org/pipermail/iommu/2016-July/017781.html>" 
https://lists.linuxfoundation.org/pipermail/iommu/2016-July/017781.html 
kernel boots but then freeze in Login Manager
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