Hmm, I had one more idea.
I used hot plug all the time (adding the device in virt-manager while the guest 
is up), I know that some security handling for apparmor and DAC are different 
between hotplug and starting with it.

Let me try to start with the device attached (but using USB 3 controller) ...
Sorry, still just works for me - was worth a try :-/

I know we have gathered a lot of logs in the former bug, but we are now
on 18.04 so lets give it another chance.

Please:
- enable libvirt debugging as instructed before
- start your guest with a USB 3.0 controller but without the USB storage drive 
passed through
- set your host to watch "dmesg -w"
- start a "tail -f" on the libvirtd log
- now attach the USB device in virt-manager
- add a few newlines to both logs
- then detach the USB device in virt-manager

Does this work?
If not please provide both logs (copy and paste from the two consoles) along 
with a "virsh dumpxml <guestname>" - maybe with the combination of those three 
we can find what is different.

Other recommendations:
- IIRC this is a windows guest, for the sake of trying how about an Ubuntu 
guest?
- Any non "Fast USB 3 storage" devices around - how about passing through a 
secondary mouse or something like that - does that work?


** Changed in: libvirt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1815588

Title:
  speed mismatch trying to attach usb device to guest vm

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