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Thread: having trouble with Jack xruns

  1. #1
    Join Date
    Jun 2005
    Beans
    137

    [Solved] having trouble with Jack xruns

    I'm having problems with xruns using Jack, real time mode is enabled (and working as far as I can tell), priority is set to 70, like everyone seems to recommend, and yet my audio sounds really bad even at 1024 frames.

    I've also tried Force 16bit and... well pretty much every combination that I can think of.

    Its just a normal sound card (the one on my motherboard), but I've managed to get it working great before.

    I've posted the log from when it starts up below:
    To be honest, its been a while since I've done this - if anyone could help explain anything it would be really handy, like what is memlock?

    Code:
    20:56:07.646 /usr/bin/jackd -R -dalsa -dhw:0,0 -r48000 -p1024 -n2 -D -Chw:0,2
    20:56:07.649 JACK was started with PID=6667.
    jackd 0.109.2
    Copyright 2001-2005 Paul Davis and others.
    jackd 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
    JACK compiled with System V SHM support.
    loading driver ..
    apparent rate = 48000
    creating alsa driver ... hw:0,0|hw:0,2|1024|2|48000|0|0|nomon|swmeter|-|32bit
    control device hw:0
    configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
    ALSA: final selected sample format for capture: 32bit little-endian
    ALSA: use 2 periods for capture
    ALSA: final selected sample format for playback: 32bit little-endian
    ALSA: use 2 periods for playback
    **** alsa_pcm: xrun of at least 0.027 msecs
    20:56:09.795 Server configuration saved to "/home/justin/.jackdrc".
    20:56:09.797 Statistics reset.
    20:56:09.803 Client activated.
    20:56:09.810 JACK connection change.
    20:56:09.814 JACK connection graph change.
    Last edited by kragen; April 25th, 2008 at 10:23 PM.

  2. #2
    Join Date
    Jun 2005
    Beans
    137

    Re: having trouble with Jack xruns

    Btw, I've just tried "Soft Mode" with very little effect - it looks like your getting less xruns in qjackctl, but its just as bad in jack.

    Its probably worth noting, the RT indicator is flashing between lit and grayed out - what does that mean?!

  3. #3
    Join Date
    Jun 2005
    Beans
    137

    Re: having trouble with Jack xruns

    Well, its working now for some reason, no idea why - I just changed a few settings, but changing them back doesn't seem to break it again.

    Oh well, would have been nice to figure out what I was doing wrong!

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