help with realtime capabilities and 2.6.20 kernels

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Hi, 
With Tapsa, a finnish kernel hacker, we are testing some kernels that he is building and uploading here for the Musix GNU/Linux distribution:
http://linux.ilmainen.net/musix/temp/
We have problems using these kernels from a non-root user: JACK has no realtime capabilities. From a root user, all went ok. But, of course, we need to use JACK as non-root user.
"# modprobe realcapFATAL: Error inserting realcap (/lib/modules/2.6.20-rc2-rt3/kernel/security/realcap.ko): Invalid argument"
¿?
"There don't even seem to be any capability module existing any more (only following beginning with "cap"):# modprobe capcapi     capidrv  capifs   capmode"
 modprobe capabilityFATAL: Module capability not found.modprobe realtimeFATAL: Module realtime not foun

 ps -C jackd -cmL  PID   LWP CLS PRI TTY          TIME CMD 8768     - -     - ?        00:00:00 jackd    -  8768 TS   19 -        00:00:00 -    -  8769 TS   24 -        00:00:00 -    -  8770 TS   24 -        00:00:00 -    -  8771 TS   24 -        00:00:00 -    -  8772 TS   24 -        00:00:00 -

As root user:
ps -C jackd -cmL  PID   LWP CLS PRI TTY          TIME CMD 8736     - -     - ?        00:00:00 jackd    -  8736 TS   19 -        00:00:00 -    -  8737 TS   24 -        00:00:00 -    -  8738 TS   24 -        00:00:00 -    -  8739 FF   90 -        00:00:00 -    -  8740 FF   80 -        00:00:00 -
It can get realtime capabilities (root allways can if the kernel is realtime enabled), and it goes ok.
What could be the problem with realtime issue and normal users? The realtime module is "obsolete" ok, but it used to work very good. 

It would be useful to build the kernel along with the obsolete realtime-lsm module? Or you dont recommend it?
-- Marcos Guglielmetti  * Director del desarrollo de Musix GNU+Linux, 100% Software Libre* CD Donwload: (http://www.musix.org.ar/en/)* Videos, programas y otras cosas en: ftp://musix.ourproject.org/pub/musix/* Reporte de errores a: https://www.musix.org.ar/wiki/index.php?title=Problemas-Bugs*IRC: #musix channel on freenode* Torrent Download:https://e.ututo.org.ar/utiles/torrent/MusixGNU-Linux0.59.iso.torrent
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