I’ve been regularly using PA to manage my hardware devices without an issue for many months.
Suddenly I seem to have a problem where the PA meters in the volume control indicate that the mic
is working, but my application (arecord) does not get any input. If I switch to the “Recording” tab in PA
it shows me that I have 3 options for my hardware interface: monitor source, monitor or the hardware itself.
Sometimes on switching devices PA seems to select the ‘Monitor source’, so I have no sound
until I manually select the last option (the hardware) at which point the mic starts working.
So the issue is that PA does not always select the right option. I’ve tried to think what I might have changed
(it does not seem to be kernel related even though I recently went to 3.2 which seems fine). I’ve also tried to find
a set of selectable options to force it into the right startup option but so far have failed to locate it.