I installed JACK and qjackctl on Ubuntu 20.04. Now jackd starts on startup, which means that my normal (non-DAW) applications can't produce sound until I run sudo killall jackd.

There's no sign of JACK or jackd in the Ubuntu startup applications, nor in sudo service --status-all, nor in sudo systemctl list-unit-files, nor crontab -e or sudo crontab -e, nor ls /etc/init.d/.

I think that's actually all of the Ubuntu software startup mechanisms I'm aware of, so this is a great learning opportunity for me: how on earth is this daemon starting itself? And how can I disable it?

EDIT: Found this in /var/log/syslog: . Maybe this has to do with pulseaudio configuration?

5

1 Answer

I had modified the PulseAudio configuration /etc/pulse/default.pa with the lines

load-module module-jack-sink
load-module module-jack-source

This was causing PulseAudio, which starts at startup, to try to start JACK at startup.

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