Hi all. As per "man jackd", "JACK is evolving a mechanism for automatically starting the server when needed. Any client started without a running JACK server will attempt to start one itself...". I've got a laptop running Debian 9 (Stretch) and this "automatic starting" mechanism for jack works perfectly. I know this because "ps aux | grep -i jackd" returns: nonroot 10609 0.0 0.0 4728 852 pts/4 S+ 01:08 0:00 grep -i jackd before I run jack-play, nonroot 10640 8.3 3.9 83412 82100 ? SLsl 01:11 0:00 /usr/bin/jackd -T -ndefault -T -d alsa nonroot 10650 0.0 0.0 4728 828 pts/4 S+ 01:11 0:00 grep -i jackd while I am running jack-play, and: nonroot 10658 0.0 0.0 4728 836 pts/4 S+ 01:12 0:00 grep -i jackd (again) after jack-play has terminated. I thought that pulseaudio might be able to use this autostart mechanism, so I've installed pulseaudio-module-jack, but when I run "pactl load-module module-jack-sink channels=2", I get either: "Failure: Module initialization failed" or "Module load failed.", and "tail -f /var/log/syslog" returns something like: Nov 11 01:52:07 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >JACK died - calling shutdown handler< Nov 11 01:52:29 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)< Nov 11 01:52:30 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)< Nov 11 01:52:31 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)< Nov 11 01:52:32 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)< Nov 11 01:52:33 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)< Nov 11 01:52:34 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory)< Nov 11 01:52:35 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: JACK error >attempt to connect to server failed< Nov 11 01:52:35 piano pulseaudio[887]: [pulseaudio] module-jack-sink.c: jack_client_open() failed. Nov 11 01:52:35 piano pulseaudio[887]: [pulseaudio] module.c: Failed to load module "module-jack-sink" (argument: "channels=2"): initialization failed. Note that if I explicitly (manually) start jackd *before* running "pactl load-module module-jack-sink channels=2", then all is good. I have also found https://docs-old.fedoraproject.org/en-US/Fedora/16/html/Musicians_Guide/sect-Musicians_Guide-Integrating_PulseAudio_with_JACK.html which makes me think that this *should* work (it includes the words "When PulseAudio starts JACK"). My question is: is pulseaudio's "not automatically starting" jackd expected, or is it a bug? Thank you for your help. Jaime
