I'm trying to start jackd with realtime priority at boot with an uptstart script but with no success so far. I'm using ubuntu server 14.04. My upstart version is 1.12.1.
The user and group I'm using in the script are allowed to use realtime priority, but when i run my upstart script that does not seems to matter. Whenever i try to run it i get this on upstart log:
jackdmp 1.9.10 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2013 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 Cannot create thread 1 Operation not permitted Cannot create thread 1 Operation not permitted Cannot create thread 1 Operation not permitted JACK server starting in realtime mode with priority 70 Cannot lock down 82274202 byte memory area (Cannot allocate memory) Cannot create thread 1 Operation not permitted ERROR: messagebuffer not initialized: libffado 2.1.9999- built Oct 19 2013 16:01:07 ERROR: messagebuffer not initialized: 1408466326248438: Error (PosixThread.cpp)[ 161] Start: Cannot create realtime thread (1: Operation not permitted) ERROR: messagebuffer not initialized: 1408466326248486: Error (PosixThread.cpp)[ 162] Start: priority: 75 firewire ERR: FFADO: Error creating virtual device Cannot attach audio driver JackServer::Open failed with -1 Failed to open server
If i run it with my regular user it works fine. My upstart script is a very simple one:
description "jackd" start on stopped rc stop on runlevel  exec su radiola -c "jackd -R -P 70 -d firewire -r 44100 -n 3 -p 2048"
I have also tried to use the setuid and setguid stanzas and start-stop-daemon but it ended up with the same results that i just described. Is there a way to make upstart start realtime process? If not, is there other solution to this problem?