Jack doesn't work

[Jakub Tětek]

Hello,
I have fresh installation of Debian 8. I have installed Guitarix, but Jack doesn't work. It tells me:

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14:24:41.656 Patchbay deactivated.
14:24:41.657 Statistics reset.
14:24:41.667 ALSA connection change.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
14:24:41.673 ALSA connection graph change.
14:24:45.156 JACK is starting...
14:24:45.156 /usr/bin/jackd -dalsa -dhw:0 -r48000 -p1024 -n2
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
14:24:45.166 JACK was started with PID=6832.
no message buffer overruns
no message buffer overruns
no message buffer overruns
jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2014 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
Failed to connect to session bus for device reservation Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection 
Audio device hw:0 cannot be acquired...
Cannot initialize driver
JackServer::Open failed with -1
Failed to open server
14:24:45.313 JACK was stopped
14:24:47.276 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started

Info about my sound cards:

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cat /proc/asound/cards .jackdrc                                                                                                                                [14:15:49]
 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xf2280000 irq 44
/usr/bin/jackd -dalsa -dhw:Intel -r48000 -p1024 -n2

Any suggestions would be appreciated.

[varpa]

Typically this sort of problem is because some other audio app is using the audio device, for example pulse audio or a standalone app which is connected to audio. I recommend http://wiki.linuxaudio.org/wiki/system_configuration and http://www.libremusicproduction.com/art ... arted-jack to learn more about jack. Unfortunately, general linux distros are often not well-optimized for professional audio work and take a fair bit of setup for good results. Audio-oriented distros like AVLinux and kxstudio are already set up and will typically work very well out-of-the-box.