Comment # 3
on bug 107898
from Felix Kühling
I'm not seeing this problem on my Raven system with 4.19-rc3+ ($ git describe v4.19-rc3-21-g5e335542de83). The most likely explanation is that on your system IOMMUv2 is not enabled. That may be a BIOS setting. If your system BIOS setup doesn't allow you to enable the IOMMUv2, then you may be out of luck. I'll attach a patch that adds some extra error messages that should confirm that or point to a different source of the problem.
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