qjackctl realtime question

jk at jasonkahn.net jk at jasonkahn.net
Fri Oct 26 16:59:51 BST 2007


i am trying to use qjackctl with the realtime option checked, so far
with no luck.

i get the following information in the messages window:

08:36:06.348 Patchbay deactivated.
08:36:06.358 Statistics reset.
JACK tmpdir identified as [/dev/shm]
08:36:06.424 MIDI connection graph change.
08:36:06.611 MIDI connection change.
08:38:45.061 Startup script...
08:38:45.061 artsshell -q terminate
JACK tmpdir identified as [/dev/shm]
can't create mcop directory
Link points to "/tmp/ksocket-jason"
08:38:45.547 Startup script terminated with exit status=256.
08:38:45.547 JACK is starting...
08:38:45.547 /usr/bin/jackd -R -dalsa -dhw:0 -r44100 -p512 -n3 -P -m -S
08:38:45.548 JACK was started with PID=5899 (0x170b).
jackd 0.103.0
Copyright 2001-2005 Paul Davis and others.
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
-1210570048, from thread -1210570048] (1: Operation not permitted)
cannot create engine
08:38:45.651 JACK was stopped successfully.
08:38:45.651 Post-shutdown script...
08:38:45.651 killall jackd
jackd: no process killed
08:38:45.858 Post-shutdown script terminated with exit status=256.
08:38:47.575 Could not connect to JACK server as client. Please check
the messages window for more info.
JACK tmpdir identified as [/dev/shm]

my set-up in qjackctl is:
server path: /usr/bin/jack
driver: alsa
frames/period: 512
sample rate: 44100
interface: (default)
dither: none
audio: playback only

i am using kernel 2.6.22-14-rt on a lenovo t61 laptop with hda intel or
AD198x Analog sound cards.
qjackctl version 0.2.22
alsa-base version 1.0.14-1

i'm not really getting any x-runs with my settings, but i figured since
i am running the realtime kernel i should also be able to use this with

thanks in advance for any help!


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