From Os X To Ubuntu

General Discussion
6

Jack is installed and working.:

  
$ sudo apt-get install qjackctl

This installs jack, dependencies, and qjackctl.

The install procedure asks me a question. I answer YES. It creates a file named `/etc/security/limits.d/audio.conf that contains:

  
# Provided by the jackd package.  
#  
# Changes to this file will be preserved.  
#  
# If you want to enable/disable realtime permissions, run  
#  
# dpkg-reconfigure -p high jackd  
  
@audio - rtprio 95  
@audio - memlock unlimited  
#@audio - nice -19

This file is sort-of a duplication of what I manually put in /etc/security/limits.conf, but whatever, I’m not going to mess with this right now.

Then in Ubuntu’s Dash I type:

  
qjackctl

Here, I click [Setup] and change the ‘Server Path’ to:

  
/usr/bin/pasuspender -- /usr/bin/jackd -S

I did this because it’s recommended here (option 4) and here (-S). Then I clicked [Start].

It doesn’t work. I keep getting the error: Cannot lock down 82246176 byte memory area.

Googling reveals two things.

  1. I probably don’t need pasuspender with the Jack that was installed (aka JACK2, aka 1.9.8, aka your versioning sucks Mr. Davis)

  2. I need to logout/login to activate the “memlock unlimted” config above. I rebooted just to be anti-Linux.

Again, after reboot, in [Dash Home] I type:

  
qjackctl

Then I click [Start].

In the messgaes log I still got “Cannot lock down 82246176 byte memory area” but the JACK server started now.

I launch Renoise, it connected to Jack, it works.

Tada.

Honestly, I don’t actually see myself using JACK (yet?). In the cases where I do want to use it, I will manually start/stop it using qjackctl.

I tested this for all of 30 seconds so no guarantees that what I did is correct. At least it’s installed?

TODO: Keep an eye on this thread Something about JACK1 vs JACK2 and Linux perfomance.