I have the same here on an ASRock K10N78FullHD-hSLI mainboard (nvidia 8200 
chipset)
but furthermore sometimes my soundcard is just not responding.

I could make out the following:
USB (OHCI-part) and VGA 8200 share the same IRQ 21
    and
USB(EHCI-part) and audio ALC1200 (onBoard) share IRQ 22

It seems to be an IRQ-sharing problem (probably with USB?)
Taking the latest nvidia graphics drivers (180.51) make it happen less often, 
but it still happens.

By the way i am using an AMD X3-(8650) Processor and 4 GB RAM
 - /dev/null

** Attachment added: "lspci_v.txt"
   http://launchpadlibrarian.net/26458680/lspci_v.txt

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