After I use Jack, the PulseAudio outputs and inputs are replaced by a dummy device. I've tried to kill PulseAudio and reload Alsa, but the only way I can use an Alsa-based application again is to reboot. I know that there must be a way to fix the problem without rebooting. I have had this problem in multiple Linux distros, including Ubuntu and currently Fedora 19.

Output of service alsa-utils restart:

Redirecting to /bin/systemctl restart  alsa-utils.service
Failed to issue method call: Unit alsa-utils.service failed to load:
No such file or directory. See system logs and 'systemctl status
alsa-utils.service' for details.

And systemctl status alsa-utils.service:

   Loaded: error (Reason: No such file or directory)
   Active: inactive (dead)

alsactl kill quit and alsactl init proceed with no errors.


The solution turned out to be simpler than it appeared. The output of fuser -v /dev/snd/* revealed jackd was silently hogging the audio card even after QjackCtl supposedly killed it. Running killall jackd fixed the problem. The problem wasn't with PulseAudio, but rather jackd running invisibly in the background.

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