This problem is due to the fact that the kernel takes down the USB
subsystem whenever a machine suspends/hibernates. On resume, the USB
stack is brought up again, but not before pulseaudio comes back, notices
audio needs to be played, and starts playing, and of course, the US
bdevice is not present.
The only way I can see this possibly being resolved, is that pulseaudio
is made aware of the suspend/hibernate, and delays playback if it
notices that a USB device is missing. The downside of this, is that the
USB device may have been unplugged, and therefore won't be detected
again.
I am pretty sure upstrea is aware of this, and will need to do some more
digging and possibly discuss resolving this somehow with them.
affects ubuntu/pulseaudio
status confirmed
** Changed in: pulseaudio (Ubuntu)
Status: Incomplete => Confirmed
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Pulseaudio sound card fallback selection changes on resume from hibernate
https://bugs.launchpad.net/bugs/605214
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