https://bugs.freedesktop.org/show_bug.cgi?id=108992

--- Comment #13 from Brian <aeon.descriptor@gmail.com> ---
FYI, as a workaround, you can use the kernel opt:

 iommu=pt

..at least, on 4.20 rc7, which is the only one I've tried that on, but it
should work with others.

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