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[Adam Dingle <adam@xxxxxxxxx>]

This may also be relevant:

https://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime/

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https://bugs.launchpad.net/bugs/1693024

Title:
  can't start JACK with real-time scheduling even when in audio group

Status in jackd2 package in Ubuntu:
  New

Bug description:
  I'm running Ubuntu 17.04.  I've installed jack2 and have added myself
  to the 'audio' group as suggested at

    http://jackaudio.org/faq/linux_rt_config.html

  But when I start JACK it reports

  Tue May 23 16:10:24 2017: ERROR: Cannot use real-time scheduling (RR/10)(1: Operation not permitted)
  Tue May 23 16:10:24 2017: ERROR: AcquireSelfRealTime error

  I am in the 'audio' group in /etc/group:

  adam:~$ grep audio /etc/group
  audio:x:29:pulse,adam
  adam:~$

  (I restarted the machine after adding myself to this group.)

  'ulimit' isn't showing real-time priority privileges for me:

  adam:~$ ulimit -a | grep real
  real-time priority              (-r) 0
  adam:~$

  The file /etc/security/limits.d/audio.conf looks like this:

  ===

  # 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

  ===

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