I'm having problems with DIO errors and glitchy audio with PD-extended 0.41.4 My computer is an HP Compaq nc6000 1.6Ghz laptop with 500mb RAM and I'm running Ubuntu 9.04. The kernel is 2.6.28-13-generic and I've tried using the realtime kernel which is 2.6.28-3-rt but it's no different. I've tried editing /etc/security/limits.conf to include the lines:
@audio - rtprio 99 @audio - nice -19 @audio - memlock unlimited
but this hasn't helped either.
I start jack with qjackctl and my settings are:
Realtime, No Memory Lock, Frames/Periods: 1024 sample rate 44100, Periods/Buffer: 2,.
Can anyone help?
thanks
James
James Dunn wrote:
Can anyone help?
probably not. i have had the same problems since i upgraded from hardy. i had more or less periodic clicks/dropouts and erros, especially whith heavy gui activity. (minimizing the gui while recording helped a little)
i have given up, and use oss instead of jack now.
bis denn! martin
James Dunn wrote:
I'm having problems with DIO errors and glitchy audio with PD-extended 0.41.4 My computer is an HP Compaq nc6000 1.6Ghz laptop with 500mb RAM and I'm running Ubuntu 9.04. The kernel is 2.6.28-13-generic and I've tried using the realtime kernel which is 2.6.28-3-rt but it's no different. I've tried editing /etc/security/limits.conf to include the lines:
@audio - rtprio 99 @audio - nice -19 @audio - memlock unlimited
but this hasn't helped either.
I start jack with qjackctl and my settings are:
Realtime, No Memory Lock, Frames/Periods: 1024 sample rate 44100, Periods/Buffer: 2,.
Can anyone help?
Check if you have some kind of CPU frequency scaling going on. Ubuntu seems to install one by default. I found that when I force the machine to run at full speed all the time I get no more glitches (well the gui causes dropouts sometimes. I often minimize all the windows and switch to an empty desktop to be safe.)
Martin
hi,
the realtime kernel of ubuntu jaunty is buggy!
i've compiled a new rt-kernel and everything is working well (no glitch, no drop-out even with a very low latency (64 frames/periods)). you need a good realtime kernel, ubuntu studio was working on releasing a new rt-kernel for 9.04. i don't know if it's already available in launchpad...
also, you can try to run jackd & pd in root. this way you will know if it's a wrong setup in limits.conf or such.
and read this: http://wiki.linuxmusicians.com/doku.php
pat
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James Dunn -
martin brinkmann -
Martin Peach -
patrick