My sound stopped working today, how can I fix it?
I'm baffled by this discrepancy:
This speaker test is successful:
speaker-test -c 6 -D 'surround51:CARD=PCH,DEV=0'
Sound Settings is behaving as if I have no sound card:
How do I find out what's causing this problem?
This discussion of a similar problem on a PulseAudio mailing list suggests that changes to
/etc/pulse/default.pa might be responsible, but I have not edited this file.