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Audio problems

When audio is not working, but aplay -D hw:x FILE, with x the audio device index, does work. The default audio device is not set.

1. pacmd list-cards to check the list of cards for the correct device index
2. edit /etc/pulse/default.pa and add:

set-card-profile x  output:analog-stereo
set-default-sink x

3. reboot or reboot pulseaudio(```pulseaudio --check; pulseaudio -k; pulseaudio -D)

https://askubuntu.com/questions/398030/change-default-sound-device