I have similar bug, but the device (icy box multi card reader) doesn't work 
since  8.10 It worked flawlessly before and also works with all windows 
versions.
The log is spammed  with
hub 2-0:1.0: unable to enumerate USB device on port 1

and sometimes mixed with lines
usb 2-1: new high speed USB device using ehci_hcd and address 82
...
usb 2-1: new high speed USB device using ehci_hcd and address 10
(always different number).

-- 
USB devices work, but constant syslog errors "unable to enumerate USB device on 
port 5"
https://bugs.launchpad.net/bugs/256767
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