What's the output from ``lsof /dev/dsp* /dev/snd/*'' after the usb audio device is unplugged before you've changed the default card to non-usb in gnome-sound-properties?
** Changed in: gnome-volume-manager (Ubuntu)
Importance: Untriaged => Low
Status: Unconfirmed => Needs Info
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USB dead after unplugging default USB audio adapter
https://launchpad.net/bugs/50838
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