LinuxQuestions.org - [SOLVED] using jack2-dbus, jack_control start gives error: DBus exception: org.jackaudio.Error

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using jack2-dbus, jack_control start gives error: DBus exception: org.jackaudio.Error

I am using Arch Linux. I installed the jack2-dbus package. I am following the arch linux jack wiki. The command:

Code:

jack_control start

results in the error message:

Code:

DBus exception: org.jackaudio.Error.Generic: Failed to open server

. I only found one suggested remedy in my google searching:

Code:

lsof +c 0 /dev/dsp

and

Code:

lsof +c 0 /dev/snd/pcm*

do not show any processes. Any help would be appreciated.

What DE are you using? Try prefixing "dbus-launch" to your command:

Code:

dbus-launch jack_control start

Thanks for the response. I am using KDE. Your suggestion did not affect anything.

Some people had a problem with knotify4. It might be pulseaudio, so you could prefix your command with pasuspender. Post the result of

Code:

tail -f ~/.log/jack/jackdbus.log

here. It might shine some light on the issue. A generic error is exactly that, so the only way is to arrive at a solution by trial and error.

Code:

[jesse@Athens VVV-1.1]$ tail -f ~/.log/jack/jackdbus.log



Fri May  9 05:56:45 2014: Controller activated. Version 1.9.9.5 (unknown) built on Tue Nov  5 09:59:45 2013

Fri May  9 05:56:45 2014: Loading settings from "/home/jesse/.config/jack/conf.xml" using expat_2.1.0 ...

Fri May  9 05:56:45 2014: setting parameter 'engine':'driver':'(null)' to value "alsa"

Fri May  9 05:56:45 2014: setting parameter 'engine':'realtime':'(null)' to value "true"

Fri May  9 05:56:45 2014: setting parameter 'drivers':'alsa':'device' to value "hw:CODEC"

Fri May  9 05:56:45 2014: setting parameter 'drivers':'alsa':'rate' to value "48000"

Fri May  9 05:56:45 2014: setting parameter 'drivers':'alsa':'period' to value "32"

Fri May  9 05:56:45 2014: setting parameter 'drivers':'alsa':'nperiods' to value "3"

Fri May  9 05:56:45 2014: Listening for D-Bus messages

Fri May  9 05:56:45 2014: Starting jack server...

Fri May  9 05:56:45 2014: JACK server starting in realtime mode with priority 10

Fri May  9 05:56:45 2014: Acquired audio card Audio1

Fri May  9 05:56:45 2014: creating alsa driver ... hw:CODEC|hw:CODEC|32|3|48000|0|0|nomon|swmeter|-|32bit

Fri May  9 05:56:45 2014: configuring for 48000Hz, period = 32 frames (0.7 ms), buffer = 3 periods

Fri May  9 05:56:45 2014: ALSA: final selected sample format for capture: 16bit little-endian

Fri May  9 05:56:45 2014: ERROR: ALSA: cannot set period size to 32 frames for capture

Fri May  9 05:56:45 2014: ERROR: ALSA: cannot configure capture channel

Fri May  9 05:56:45 2014: ERROR: Cannot initialize driver

Fri May  9 05:56:45 2014: ERROR: JackServer::Open failed with -1

Fri May  9 05:56:45 2014: ERROR: Failed to open server

The problem is this:

Code:

Fri May 9 05:56:45 2014: ERROR: ALSA: cannot set period size to 32 frames for capture

Increase the number of frames per period till it works. Default is 1024. I can get it down to 16 on my system. The more frames per period, the greater the latency. See what works for you.

Thank you DJ Shaji, The following commands solved the problem:

Code:

jack_control dps period 64

dbus-launch jack_control start

I'm up and running.

Quote:

Originally Posted by Laertiades (Post 5168529)

Thank you DJ Shaji, The following commands solved the problem:

Code:

jack_control dps period 64

dbus-launch jack_control start

I'm up and running.

Glad to be of help :)