[Bug 215906] DMAR fault when connected usb hub (xhci_hcd)

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https://bugzilla.kernel.org/show_bug.cgi?id=215906

--- Comment #10 from The Linux kernel's regression tracker (Thorsten Leemhuis) (regressions@xxxxxxxxxxxxx) ---
(In reply to Chris Bainbridge from comment #9)
> The IOMMU error is caused by a buggy VL805 firmware. 

Makes me wonder: would it be possible to detect an old firmware and avoid the
IOMMU path in this case? Or at least warn?

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