[LAU] sound card "sync/distortion"

Atte André Jensen atte.jensen at gmail.com
Tue Mar 17 04:01:20 EDT 2009


I have a toshiba laptop with a "HDA Intel" sound card and an Edirol USB 
ua-1a sound card.

atte at vestbjerg:~$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller (rev 03)

Although none of these are pro cards and I don't expect them to be able 
to perform well with low latency, I have a problem that I feel should be 

If I run jack through qjackctl, clients can often "mess up" jack esp 
when loading heavy stuff. This results in the sound becoming distorted 
in a metal-like way. A simple restart of jack seems to resolve this.

If I run ChucK with the alsa interface, the problem often is there, 
seems to be more often the lager the ChucK project (so the more there is 
to load and the heavier the cpu load is).

To me it feels like "something with the soundcard setup", can anyone 
recognize the problem from my description and what could I do to remedy 
this? I'm hoping for some magic option to put in /etc/modules* or 
something like that :-)

NB: I'm running ubuntu 8.04 with 2.6.24-21-rt kernel. Realtime 
performance is setup and otherwise working fine.


http://atte.dk    http://modlys.dk

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