Вот что он выводит:
$jackd -R -d alsa -p 64
jackd 0.109.2
Copyright 2001-2005 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
JACK compiled with System V SHM support.
cannot use real-time scheduling (FIFO at priority 10) [for thread -1209882944, from thread -1209882944] (1: Operation not permitted)
cannot create engine
Что характерно, содержание /etc/security/limits.conf:
# REALTIME support for audio group users
@audio - rtprio 99
@audio - nice -10
@audio - memlock 250000
Пользователь состоит в группе audio.
$ulimit -r
99
Есть какие-нибудь предложения?