a-schmidt@ulanbator:/var/log$ lspci -nn | grep USB
00:14.0 USB controller [0c03]: Intel Corporation C620 Series Chipset Family USB 
3.0 xHCI Controller [8086:a1af] (rev 09)

Output of dmesg is attached.
At kernel timestamp 2.544086 you can see the telltale "couldn't allocate 
usb_device" message.
Starting at 4181.282035 there's the manual unbind, then at 4185.895352 the bind 
and subsequent detection of the previously missing Smart-UPS device.


** Attachment added: "dmesg output"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1939638/+attachment/5575563/+files/dmesg.log

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https://bugs.launchpad.net/bugs/1939638

Title:
  [regression] USB device is not detected during boot

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