[LAU] jackd thinks it's got realtime priority, but it doesn't

I just noticed this on my Fedora 17 system. I run jackd like this: [paul@watt ~]$ /usr/bin/jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2 jackdmp 1.9.9.5 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2012 Grame. jackdmp 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 no message buffer overruns no message buffer overruns no message buffer overruns JACK server starting in realtime mode with priority 20 audio_reservation_init Acquire audio card Audio0 creating alsa driver ... hw:0|hw:0|512|2|48000|0|0|nomon|swmeter|-|32bit configuring for 48000Hz, period = 512 frames (10.7 ms), buffer = 2 periods ALSA: final selected sample format for capture: 32bit integer little-endian ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 32bit integer little-endian ALSA: use 2 periods for playback Using port names patch v0.1 (07.04.2010) Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ss.ports.in Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ports.in Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ss.ports.in Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ports.in Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ss.ports.out Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ports.out Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ss.ports.out Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ports.out Everything looks fine, and jackd claims it has realtime mode. I've been away from Linux audio for a while, but doesn't realtime mode mean RT scheduling? If I check the process's scheduler policy and priority, it is NOT RT: [paul@watt ~]$ ps -p 20370 -o cmd,class,pri,rtprio CMD CLS PRI RTPRIO /usr/bin/jackd --realtime - TS 19 - I've added myself to the jackuser group: [paul@watt ~]$ groups paul wheel dialout wireshark jackuser That group is already set up properly: [paul@watt ~]$ cat /etc/security/limits.d/95-jack.conf # Default limits for users of jack-audio-connection-kit @jackuser - rtprio 70 @jackuser - memlock 4194304 @pulse-rt - rtprio 20 @pulse-rt - nice -20 Anyone have any idea what's going on here?