View Full Version : [ubuntu] I can get JACK to work. Help, please!

Solomon Douglas
February 7th, 2011, 03:01 AM
I'm using Ubuntu 10.10 on a Dell Inspiron 6400 (or Inspiron e1505). I'm having an impossible time getting JACK to work. In my attempt to follow the instructions given by the user cb951303 in http://ubuntuforums.org/showthread.php?t=806730, Here's what I've tried so far:

I've installed packages jackd and qjackctl. I've added my user to the "audio" group. I've added the following three lines to /etc/security/limits.conf:

@audio - rtprio 99
@audio - memlock unlimited
@audio - nice -19

I've logged out and in, and restarted the system, countless times.

I've configured the JACK settings as per http://ubuntuforums.org/attachment.php?attachmentid=71520&d=1211718505 and http://ubuntuforums.org/attachment.php?attachmentid=71521&d=1211718505 (as recommended in http://ubuntuforums.org/showthread.php?t=806730).

I click on "Start", and I get the following error message:

Could not connect to JACK server as client.
- Overall operation failed.
- Server communication error.
Please check the messages window for more info."

The messages window is full of this:

JackAudioDriver::ProcessAsync: read error, skip cycle

I've tried changing "Frames/Period" to every value in the drop-down list.

What should I try next?

February 7th, 2011, 12:24 PM
Xruns mean jack can start but your settings are not optimal. I used to have an Inspiron 6400 and I remember the onboard card did not work well with jack, but I never did find out why.
Could you post the complete message window output?
And also this from a terminal:
aplay -l

February 7th, 2011, 12:43 PM
"Could not connect to JACK server as client" indicates that jackd failed to start, the cause of which should also be in the log output, somewhere above that message.