I tried the following:

-Start Mp3 playback with totem
-run "jackd -dalsa -dhw:0 -r44100 -p128 -n2 -m -H -M"
   Result:
   the capture device "hw:0" is already in use. Please stop the application 
using it and run JACK again
   cannot load driver module alsa

- Klicked on the speaker icon and changed the profile as described above
- run "jackd -dalsa -dhw:0 -r44100 -p128 -n2 -m -H -M"
Works.

-- 
pulse audio stop when qjackctl is launched
https://bugs.launchpad.net/bugs/231601
You received this bug notification because you are a member of Ubuntu
Studio, which is a bug assignee.

Status in “pulseaudio” package in Ubuntu: Confirmed

Bug description:
So, 

I own 2 sound cards, the fisrt is an hda-nvidia integrated to the mother board. 
And for audio working purpose, I use on my worksation a RME hdsp multiface II 
sound card with its pci adapter. I edited the /etc/modprobe.d/alsa-base file to 
set the integrated chipset as default, index=0, and the second as index=1.

The problem I have is that when I launch Qjackctl, even without starting jack, 
Pulse Audio stop to send to sound to my mother board sound card. Very annoying 
problem. Is there a way that Pulse Audio always use the same sound card and 
never stop ?

Toine

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