[LAU] no realtime priority possible with wdm/openbox

Hi I have a cpu-hog problem with my debian/lenny and someone suggested it might be caused by gnome. So I installed wdm (instead of gdm) and openbox to completely bypass any gnome stuff. However when I log in from wdm to openbox I cannot start jack with realtime priority, I get this in the messages window of qjackctl: 15:45:00.693 Patchbay deactivated. 15:45:00.695 Statistics reset. 15:45:00.705 JACK is starting... 15:45:00.706 /usr/bin/jackd -R -P80 -dalsa -dhw:1 -r44100 -p256 -n3 -s 15:45:00.723 ALSA connection graph change. 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 -1209067856, from thread -1209067856] (1: Operation not permitted) cannot create engine 15:45:00.750 JACK was started with PID=14293. 15:45:00.763 JACK was stopped successfully. 15:45:00.763 Post-shutdown script... 15:45:00.764 killall jackd 15:45:00.909 ALSA connection change. jackd: no process killed 15:45:01.170 Post-shutdown script terminated with exit status=256. 15:45:02.913 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info. Esp the "cannot use real-time scheduling (FIFO at priority 10) [for thread -1209067856, from thread -1209067856] (1: Operation not permitted)" seems to nail the problem. What should I do to make it possible to start jack with realtime priorities and why does it have anything to do with gnome? I've been using this combo (wdm/openbox) in the past with no problem... -- Atte http://atte.dk http://modlys.dk