[LAU] jackd in realtime as user: a no-go in spite of modifying limits.conf

[Ray Rashif]

2009/11/21 cal <cal at graggrag.com>

> Der Mickster wrote:
> > Hey,
> >
> > Can't seem to start jackd in realtime as user on ubuntu studio. It
> > does start as root, but that's hardly a consolation (unless I run all
> > audio software as root, which would be kinda daft IMO)
> >
> > @audio - rtprio 99
> > @audio - nice -10
> > @audio - memlock unlimited
> >
> > have been added to /etc/security/limits.conf
> >
> > Nevertheless, starting it as user just doesn't seem to work, and I
> > just can't figure out why. I've googled the issue, and everybody seems
> > to agree that modifying limits.conf in the above manner should solve
> > the problem - yet this is what I get:
> >
> >
> > mick at kaizoku:~$ jackd -R -P89 -dalsa -dhw:0 -r48000 -p256 -n3 -S &
> > [1] 3092
> > mick at kaizoku:~$ no message buffer overruns
> > jackd 0.116.1
> > 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
> > -1217255744, from thread -1217255744] (1: Operation not permitted)
> > cannot create engine
> >
> > Any ideas?
>
> Not sure if this is a possible answer to the question, or perhaps another
> question altogether, but ... I've struggled with the same issue on a debian
> system for some time, then discovered this in /etc/pam.d/su -
>
> # Sets up user limits, please uncomment and read /etc/security/limits.conf
> # to enable this functionality.
> # (Replaces the use of /etc/limits in old login)
> # session    required   pam_limits.so
>
> So far, I'm still not sure if uncommenting the 'session required
> pam_limits.so'
> line actually solves the problem, but I am curious.
>
> cheers.
>
> (I dumbly sent this to just the op instead of 'reply all', so fwiw I'm
> repeating
> it to the list)
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>

Yes, that one is only when you do not use a PAM-enabled login, i.e you log
in via VC. Probably 4/5 login managers are PAM-enabled, or maybe even 5/5.
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