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? Regards, Bill