Hi, I've the same behaviour on my Lenny system: alsa_pcm: xrun of at least 1226435427565.568 msecs Here some more information: ii jackd 0.109.2-3 ii linux-image-2.6.25-2-686 2.6.25-7 ii linux-image-2.6.26-1-686 2.6.26-8 It seems to be a Kernel related issue. If I boot a kernel, that I've compiled on my own (2.6.23.14 from kernel.org with additional realtime patch), my xruns shows normal values. Regards Frank