Jack and Ubuntu

[witch]

A friend of mine is struggling with this.

He is getting this error message:

JACK compiled with System V SHM support.

loading driver ..

apparent rate = 44100

creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit

control device hw:0

ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to capture-only mode

cannot load driver module alsa

no message buffer overruns

13:28:04.003 JACK was stopped successfully.

13:28:06.018 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.

 

Can anyone help? I know less than nothing about this stuff!

[twin--turbo]

does sound work at all?

 

TT

[witch]

@twin-turbo

this is the answer I got:

Sound on the system works.Issue is with Jack and therefore any software reliant on it. ..

[jinnantonnixx]

Maybe the ALSA plugins are missing:

Install libasound2-plugins either from the software centre/synaptic or from the terminal prompt:

sudo apt-get install libasound2-plugins

 

I use Jack all the time with MusE sequencer.

Edited February 23, 2016 by jinnantonnixx

[witch]

Thanks - I'll tell him. Anything else?

[twin--turbo]

it may be referencing the wrong hardware ,

if "aplay -l" comes back with more than onde device he will need to experiment starting jackd with different hardware id's

 

don't use JACK, it's rare that I ever use sound of any sort.

 

TT

[jinnantonnixx]

Install qjackctl.

Qjackctl offers a user interface for controlling the JACK sound server

daemon. At the same time it figures as a JACK patch bay and monitoring

tool.

 

This is a graphical control for Jack. From here you can choose the hardware from drop-down boxes.

[jinnantonnixx]

If all that fails, try deleting the Jack config (don't worry, it will be recreated next time Jackd saves its settings)

 

rm ~/.config/jack/conf.xml

 

Then run the graphical qjackctl tool.

Configure Jack to use the hardware it finds, then save the settings.

 

To be fair, I hardly ever get into a tangle even with a couple of different USB sound cards, Jack, ALSA and PulseAudio running together.

Edited February 23, 2016 by jinnantonnixx

[witch]

thanks guys - something worked so he is OK now