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Thread: Jack control freezes

  1. #1
    Join Date
    Apr 2008

    Jack control freezes

    Hi all. I'm new to linux and installed ubuntu studio onto my laptop specifically for music production. Unfortunately I haven't been able to explore the delights of this promising package because qjackctl freezes as soon as I load any of the music packages.

    System specs:

    Intel® Celeron™ M Processor 440, 1.86GHz, FSB 533MHz, 1MB On-Die L2 Cache, 1 gig mem

    I know I need more memory but surely qjackctl doesn't use it all?

    Any help that gets me going would be very much appreciated.

    Thank you.


  2. #2
    Join Date
    Jun 2006

    Re: Jack control freezes

    Your specs look plenty good for music production.

    Try running qjackctl from terminal and see what that says. Post the output here if you want help interpreting. Look at the 'Messages' box in qjackctl as well. It has some debug information, and it would help to see what it's doing at the time of the freeze. It would also help to know what you have done so far to get it working. Have you followed any tutorials where you un/install a program or edit a config file? Have you enabled and are you using the real time kernel?

  3. #3
    Join Date
    Apr 2008

    Re: Jack control freezes

    Thank you Warbread, As for un/installing and editing config files, I have done neither. This is a completely clean, brand new installation of Ubuntu studio. (Finally got rid of the pre-installed Vista - and it feels great!) ;D

    I ran qjackcontl from terminal and I got the following message which means very little to me (AsI said, I'm completely new to linux)

    Warning: no locale found:/usr/share/locale/qjackctl_en_GB.qm

    The messages from within jackctl is as follows:
    20:00:12.000 Patchbay deactivated
    20:00:12.148 Statistics reset.
    20:00:12.165 Startup script
    20:00:12.166 artsshell -q terminate
    20:00:12.337 ALSA connection graph change
    20:00:12.654 startup scrip terminated with exit status=256
    20:00:12.654 Jack is starting
    jackd 0.109.2
    (copyright stuff followed by)
    cannot lock down memory for jackd(Cannot allocate memory)
    20:00:12.666 Jack was started with PID=6031
    loading driver..
    apparent rate 44100
    creating alsa driver...hw:0|hw:0|1024|2|44100|00nomon|swmeter|-|32bit
    control devise hw:0
    configuring for 44100,period-1024 frames (23.2ms),buffer-2 periods
    ALSA final selected sample format for playbck:32bit little-endion
    ALSA:use 2 periods for capture
    ALSA final selected sample format for playbck:32bit little-endion
    ALSA:use 2 periods for playback
    JACK:unable to mlock() port buffers:cannot allocate memory

    and a little more that I can't see because everything at this point freezes and I can't scroll down any further, nor can I copy and paste though that may be typical.
    I hope this helps.
    Thank you again.
    Last edited by Hotrock; May 2nd, 2008 at 11:08 PM.


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