Hi My old thinkpad running ubuntu 7.10 died and I'm now on a new laptop (toshiba satellite) with ubuntu 8.04. I'm having alot of trouble getting good realtime performance, not sure what's caused by ubuntu or the laptop. I installed "linux-rt" which seems to have provided some kind of realtime kernel: atte@vestbjerg:~$ uname -r 2.6.24-19-rt I also edited /etc/security/limits.conf to contain: @audio - prio 99 @audio - rtprio 99 @audio - nice -10 I can run jack with rt-priority 80, but am getting x-runs and audio breakup even at light load and conservative latency (17ms). One of the things I have a feeling might be causing trouble is pulseaudio. Should this be disabled, and if so how? What else am I missing? NB: I'm mostly testing this with eXT2, which performed great on my thinkpad. NB2: This is a dualcore, 2Ghz, 2Gb ram machine with a fresh ubuntu 8.04 Any ideas appreciated

@audio - prio 99

I have a Toshiba Satellite. You may find that the built-in Intel video contributes a lot to xruns - and I'm not sure what you can do about it.

I tried my edirol usb soundcard, and that seemsto run glitch-free at 17ms (but no lower). Is that as low as usb goes or should I be able to improve that?

I use an edirol UA-25, and it can go lower, however, USB is rather limited. I don't use it below 128 frames/period (~8ms). 64 frames/period (~4ms)seems to be the lowest working setting but I don't recommend it. All values as reported by qjackctl, so it's 'roundtrip-latency' I guess.