Found a similar bug and also a "workaround"    Bug is 645211.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/645211 .  I wonder
what negative effect that turning off ehci might have.

Workaround in comment #7:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/645211/comments/7

Quote:
Same / Similar issue - USB was working (Flash drives and USB Canon i965 
printer) & then stopped working...
Found turning off ehci allowed both to work....

cd /sys/bus/pci/drivers/ehci_hcd/
sudo sh -c 'find ./ -name "0000:00:*" -print| sed "s/\.\///">unbind'
(echos unbind to the ehci device id)

End Quote:

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USB drives do not automount after desktop loaded
https://bugs.launchpad.net/bugs/669902
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