Jack is stable using freebob with 4ms latency --- sample rate is 48kHz /// 64 frames/period /// 3 periods buffer

My laptop is an HP Pavillion 6700 running ubuntu studio 8.04 with kernel 2.6.24-19-rt
the firewire chipset is: Ricoh Co Ltd R5C832 IEEE 1394 Controller

The only thing I had to do was:
# modprobe raw1394
and then change it's permission on /dev/raw1394

thanks for the answers!

surian