[ubuntu-studio-users] Jack can´t start

[Ralf Mardorf]

On Tue, 2016-03-29 at 16:37 +0100, Joao Bruno wrote:
> this the jack version
> jb at jb-SATELLITE-L50-B:~$  pulseaudio --kill
> jb at jb-SATELLITE-L50-B:~$ jackd -dalsa -dhw:1 -r48000 -p1024 -n3
> jackdmp 1.9.10
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2013 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
> no message buffer overruns
> no message buffer overruns
> no message buffer overruns
> JACK server starting in realtime mode with priority 10
> audio_reservation_init
> Acquire audio card Audio1
> creating alsa driver ... hw:1|hw:1|1024|3|48000|0|0|nomon|swmeter|-
> |32bit
> configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 3
> periods
> ALSA: final selected sample format for capture: 32bit integer little-
> endian
> ALSA: use 3 periods for capture
> ALSA: final selected sample format for playback: 32bit integer little-
> endian
> ALSA: use 3 periods for playback

If you now would start qjackctl, while jackd still runs in the terminal,
it would work.

> this is the message after i did your orientations

No, you most likely didn't continue running jackd in the terminal, when
launching qjackctl.

> [snip]
> /dev/audio|/dev/audio|1024|3|44100|0|0|nomon|swmeter|-|32bit
                               ^^^^^
                               ^^^^^
Qjackctl does use different settings, instead of 48000 used by the
terminal and qjackctl by default doesn't kill a running instance of
jackd, it does use it, as long as there is no bug or a script is started
by the jackd settings. In qjackctl's settings ensure that in "Options"
"Execute script at startup" is unchecked, disabled.

> ALSA lib control.c:953:(snd_ctl_open_noupdate) Invalid CTL /dev/audio
> control open "/dev/audio" (No such file or directory)
> ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM /dev/audio
> ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM /dev/audio
> ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to
> capture-only mode
> Cannot initialize driver
> JackServer::Open failed with -1
> Failed to open server
> 16:36:09.369 JACK was stopped with exit status=255.
> [snip]

Your qjackctl settings are bad, and/or qjackctl is buggy and or some
pulseaudio-jack-thingy still gets started.