Great you've asked, I am having the same problem. "su - user" does not work, but logging in as user and run the same command does. Happens with both, jack and jack2. With jack2 I am also getting an error that it can't open X, wenn run from command line. But that maybe an issue specific to the jack2 version of arch, as there is no reason why jackd should need a display.

Am 17.04.2015 um 11:40 schrieb Athanasios Silis:

Hi all,
I am trying to run jackd instance from /etc/rc.local (along with a few
other applications) from a custom made init script.

The system is ubuntustudio and I have setup everything to have elevated
permissions when executing applications from the @audio group.

so when I am logged on, I see this:
nass@starkill:~$ ulimit -r -l
real-time priority              (-r) 95
max locked memory       (kbytes, -l) unlimited

which is expected and I can execute the script I wrote.

but, when I execute my script from /etc/rc.local as
su - nass -c "ulimits -r -l cd audio_setup/scripts ; bash ./start_audio"
then my user does not (yet?) have elevated permissions.

real-time priority              (-r) 0
max locked memory       (kbytes, -l) 64

is there a script I can run before my start_audio script to elevate my
permissions?

thank you

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