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All the sound works perfect with all the applications on my system. But from the moment I launch Ardour, no more sound comes out from other application than Ardour. The easy way to get it back is to restart the laptop.

This is probably related to Jack ... but it's not clear...

Does anyone know what's going on behind the scene? How to fix it?

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in Terminal:$ top | grep jackd, first number in line will be the pid of JACK, kill it with $ kill <pid>. It's the simplest way)

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What about pkill or pgrep instead of top|grep? ;) – 0xC0000022L Jul 28 '14 at 11:21
works!! thank you so much :) – Mina Michael Aug 24 '14 at 18:39
As @0xC0000022L suggested pkill -9 jackd also works ;) – 0xC0DEGURU Oct 23 '15 at 16:34

I am still figuring out jack and ardour, but you probably need to stop jack. I use qjackctl which you can find in the software center (if you don't already have it installed). after you finished with ardour hit stop in qjackctl and in my system normal sounds start working again.

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That is not enough ... still no sound! – samb Nov 3 '13 at 20:11

Theres probably a more hygienic method, but opening up the task manager and killing the jackd process fixed the same problem for me.

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After intalling adour I got no sound from my speakers. In “Sound preferences”, in the “sound output” tab, select “analog audio output”, and I got sound.

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Just to share the way I wrote the command to kill jackd:

sudo killall jackd
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Hello! This would be better suited as a comment posted upon the answer which suggests to kill the jackd process rather than as its own answer. As you have the comment privilege, you should be able to add a comment to the other answer that suggests killing jackd by using the "add a comment" button underneath the other comments on that answer. – Thomas Ward Jun 26 at 17:03

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