[puredyne] full install jack realtime issue

[grant centauri]

Hello.

I'm not entirely new to Pure:Dyne, and I've been hacking around with linux
for over 2 years now so I'm generally able to solve problems on my own, with
help of internet discussion of course, but I can't seem to get this one.

I have the same problem on another machine I've tried installing a realtime
kernel on as well.

I followed the instructions for a full install of pure:dyne; fresh debian
install, updated repositories, updated apt, downloaded the realtime kernel
(2.6.29.3-rt14-pure-686 #1 SMP PREEMPT RT), booted into it and uninstalled
the standard kernel, and proceeded to install all of the pure:dyne standard
packages.

Once that was done I thought I'd try to start up jack in realtime and play
around a bit to make sure things worked.  However when I try to start jack I
get this error message (the same as on the other machine with a realtime
kernel, these are kernels I did NOT compile myself, but downloaded from
repositories):

JACK compiled with System V SHM support.
cannot use real-time scheduling (FIFO at priority 10) [for thread
-1212373328, from thread -1212373328] (1: Operation not permitted)
cannot create engine

If I run the same command as root, jack starts fine.  So the realtime
capabilities seem to be there.  I know the first answer will be "Edit your
/etc/security/limits.conf and add the @audio rtprio and so on..."  I've done
this, and it doesn't help.  I think it has something to do with memory, and
not the audio preemption.  The only relevant thing I could find had
something to do with the realtime_lsm module, which I tried building for
this kernel, but it didn't work.  So I'm really unsure of what to do here.
When I run modprobe, I don't get any results for a realtime module of any
kind.  But why wouldn't the pure:dyne kernel be compiled correctly to
support realtime?  I just don't get it.  Perhaps its a simple permissions
problem (something to do with /dev/shm?) but I can't figure it out.  If
anyone has any insights or advice, please let me know.  I'd love to have
realtime capabilities without using a liveCD.

Thanks,

Grant
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