Hi Imperia, I built a mainline kernel (version 4.16) with a different
quirk that I think might help here. Can you test it? Thanks in advance!

Instructions (run all as root):

1) wget people.canonical.com/~gpiccoli/imperia416.tgz
2) mv imperia416.tgz /
3) tar -zxf imperia416.tgz
4) update-initramfs -c -k 4.16.0-imperia+

Now that's important: if you have access to some serial console in the
machine (or if you have physical access), you can reboot into this new
kernel. In case _you only have ssh_, I'd suggest to remove the kernel
boot entry from grub, and boot through kexec for safety reasons:

a) Remove boot entries from grub.cfg (you can copy away vmlinuz-4.16-imperia+ 
to some place outside /boot and run "update-grub" for this)
b) apt-get install kexec-tools
c) kexec vmlinuz-4.16-imperia+ --initrd initrd.img-4.16-imperia+ 
--append="$(cat /proc/cmdline)"

After machine (hopefully!) boot to the new kernel, check in dmesg if the quirk 
is there:
#$ dmesg|grep QUIRK

If you can see that output ("QUIRK: XHCI_AVOID_BEI"), then the quirk was 
Now, just need to try to reproduce the issue again.

Thanks a lot,


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