When I log in, neither of my USB devices is seen. It's really driving me round the bend, I have USB keyboard and mouse connected. I have to unplug them then plug again and only then it works correctly.
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I have a similar issue with a wireless mouse that sometimes fails to boot up. Unplugging and re-plugging the receiver solves it. Someone once told me the receivers 'wear out'. Certainly it never used to happen, and the mouse concerned is getting old (i.e. about a year).
But IDK why a wired USB would fail in this way. (Or are we talking about a wireless k/b & mouse here?)

Bobble
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lsusb
to your initial question – Mark Rooney Jul 06 '12 at 23:40/var/log/kern.log
, command(s):dmesg
,lsusb
– ish Jul 07 '12 at 00:17