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f33e652
(Get the code!)
A user has reported extensive performance issues with a Lenovo Thinkpad X1 Extreme Gen 2 laptop computer, in bug 1973434. The user reports video playback hangs, browser hangs and virtual machines hanging.
Their dmesg indicates the system has 2x IOMMUs and there are 25 groups being configured. They tested "intel_iommu=off", and the performance issues are no longer seen.