Comment 9 for bug 1147405

I have similar issue qjackctl

pasuspender -- jackd -d alsa -d hw:0

ATTENTION: The playback device "hw:0" is already in use. Please stop the application using it and run JACK again

my user is in groups audio, pulse, ...
several reboots

Hunted down any program that could run audio and kill them
still not working
This happened after following troubleshooting
https://help.ubuntu.com/community/SoundTroubleshootingProcedure

alsa info sh

http://alsa-project.org/db/?f=9a8410ea124a25e1830f39bca4fbd4c363a701ca