On Fri, 07 Apr 2006 15:22:05 -0400, "Lee Revell" <rlrevell@xxxxxxxxxxx> said: > On Fri, 2006-04-07 at 09:59 -0400, Bill Allen wrote: > > Hi, > > On my laptop, I'm running ubuntu dapper. Using the 2.15.18 kernel, all my audio applications work great OOTB. Very few xruns. With the latest two kernels (2.15.19 and 2.15.20), when I start jack using qjackctl, it immediately starts reporting xruns at the rate of about 10 per second - and this is with no applications running at all. I'm not sure about how to go about debugging this. > > > > Any ideas? > > It's possible that they used to use realtime-lsm and recently switched > to the rlimit approach (although, shouldn't JACK bomb out if started > with -R and realtime scheduling is unavailable, rather than failing > silently?). > > Try adding this to the end of /etc/security/limits.conf: > > * rtprio hard 99 > * nice hard -20 > > Then reboot and try it again. > > If it still fails please post the JACK output > > Lee > I'll try to do as you suggest. As I understand it (which could be not at all) Dapper doesn't support realtime-lsm in any of those kernel builds. It uses Rlimits-Aware PAM. I've added myself to the audio group and as I mentioned, jack works great in 2.6.15-18, but in *-19, and *-20 it's miserable. Bill
