For what i have seen so far it might be an IRQ or IRQ sharing problem.
Does anybody encounter this problem when using an external graphics card?
It seems that this bug occurs randomly (in my case it seems to be connected 
with a video player. It does not matter whether driver i use (nvidia or nv or 
vesa) sometimes when this bug occurs and i do not shut down, but RESTART, my 
onboard soundcard is malfunctioning too (no sound at all).
Just a wild guess: When there is the "right" combination of Interrupts the 
system just drops one of them or signals a complete wrong state.
As soon as i have a little spare money i buy a PCIe card to test it.

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usb ports randomly shut off Jaunty beta
https://bugs.launchpad.net/bugs/350065
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