Hi thanks for the good quality bug report!
The speed mismatch is only a warning and shows that it fails to detect
the speed.
The actual issue that breaks your case is the "failed to open host usb device
2:6".
I'd first of all assume it might be an apparmor deny or something similar.
Could you track dmesg -w while you try to attach the device.
Are there any denies reported int hat regard?
Further could you please make sure that
$ virsh nodedev-list
lists your device (the one you try to add)
and also report
$ virtsh nodedev-dumpxml <id>
here just for completeness.
As for usb 3.1, which host release of Ubuntu and which kernel are you using?
** Changed in: libvirt (Ubuntu)
Status: New => Incomplete
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libvirt usb 3.1
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