A friend of mine has just installed ubuntu with a little phone support from me. The changes we did were: 1) Add him to the audio group /etc/udev/rules.d/40-permissions.rules 2) Add the following to KERNEL=="raw1394", GROUP="audio" KERNEL=="dv1394*", GROUP="audio" KERNEL=="video1394*", GROUP="audio" 3) Install a realtime kernel However he still reports that jack exits after about 10s with buffersize 128 and he get's lots of xruns on larger buffer settings (I think even on 1024). This surprises me, since I run standard ubuntu (recently installed the realtime kernel, though) with no xruns on buffersize 128 with an FA66. Is there anything I forgot in my over-the-phone instructions? Other ideas on how to narrow this down? NB: I don't his computer, but according to him, it's an "old laptop"...