Things seem to be getting worse. Now after a clean reboot, my external
USB keyboard and mouse are detected only when I call lsusb from the
console.

After a short while, my mouse disappears once again, and lsusb needs to
be called again in order to redetect it, after which it works again for
about ten seconds before dying. As long as the mouse continues sending
events (I roll the trackball around) it stays connected. The moment it
is idle again, it's permanently disconnected until another lsusb. This
is also now under the generic natty kernel.

My builtin keyboard and mouse work throughout.

I'll see if I can eliminate some kind of physical issue with the mouse
when I get hold of another one. As for physical issues with the laptop,
I don't know what I can check to ensure that the USB subsystem isn't
actually disappearing and then reappearing on the bus because of some
wiring issue.

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https://bugs.launchpad.net/bugs/779735

Title:
  Natty doesn't detect external USB harddisk drive

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