> If you tell me how to initialize a mouse there I can try :-)

Sorry, bad wording on my part. The USB device I am connecting is a
Logitech Nano Receiver ... keyboard and mouse both connected to it. So
at the UEFI / Grub stage - only the keyboard, as you correctly point out
:-).

> It only matters if you have your mouse working, but then issues with
> the multitude of mouse-inputs.

Not 100% sure I follow you :-). But I do have "two" mice connected - one
on the guest (USB Passthrough), the other to virt-manager ... which is
running over X-Windows from the host to an X-Server. Not sure that makes
any difference, but just in case!

> Due to that if you use GPU passthrough (and no other virtual display)
> the channel through spice won't exists and therefore no conflicting
> inputs will happen.

I can disable spice if you want, go only USB Passthrough. Just let me
know. I have done that before, can try it (for this particular issue).


BTW, another thought. The VM is defined as Q35 - in fact, a few items below, 
just in case they could be part of this,
    <type arch="x86_64" machine="pc-q35-5.2">hvm</type>
    <qemu:arg value="-cpu"/>
    <qemu:arg 
value="Penryn,kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on,+pcid,+ssse3,+sse4.2,+popcnt,+avx,+aes,+xsave,+xsaveopt,check"/>
    <qemu:arg value="-smbios"/>
    <qemu:arg value="type=2"/>

Thanks!

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https://bugs.launchpad.net/bugs/1906155

Title:
  USB Passthrough Fails on Start, Needs domain Reset

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