Can you unload the ehci_hcd driver and see if this helps?
It looks like brltty is causing some USB resets, or is resetting the
device...I'm not sure this is a kernel bug, because it may be brltty
doing something wrong to cause these resets.
** Changed in: linux-source-2.6.20 (Ubuntu)
Status: Confirmed => Needs Info
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USB braille display no longer starts with brltty
https://launchpad.net/bugs/80892
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