uff non va... ho provato sia con la comoda (

) interfaccia grafica, sia da linea di comando come hai detto te.... ma niente
merlino:/home/lele# /usr/bin/jackd -R -d alsa -d hw:0 -p 128
jackd 0.94.0
Copyright 2001-2003 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
loading driver ..
creating alsa driver ... hw:0|hw:0|128|2|48000|0|0|nomon|swmeter|rt|32bit
jackd: pcm.c:690: snd_pcm_nonblock: Assertion `pcm' failed.
Abortito