So trying the system from a 10.04 live CD, I experience the same
issue...no USB response after a period of time.  Each time it will boot
up with full usb support for both mouse, keyboard, external drive
etc...If I leave it for a bit, then everything connected to the USB
ports quits working.  Doesn't matter which usb port i try..front ports,
back ports, none of them work..   I followed the instructions for the
apport (while running off the live CD).  I'm not sure exactly what you
are wanting me to do to test the upstream kernal.  I have no clue how I
would go about testing it and reporting back any sort of valuable
information.  I'm not a complete linux newbie (been running it for
several years now) but I really don't knwo what I'm doing when it comes
to any sort of testing or programing.

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All USB ports suddenly stop working
https://bugs.launchpad.net/bugs/577648
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