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[Igor Sakulin <1877129@xxxxxxxxxxxxxxxxxx>]

Please see attached systemd log

** Attachment added: "jrn"
   https://bugs.launchpad.net/ubuntu/+source/jackd2/+bug/1877129/+attachment/5367437/+files/jrn

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https://bugs.launchpad.net/bugs/1877129

Title:
  jackd won't run in realtime

Status in jackd2 package in Ubuntu:
  Incomplete

Bug description:
  Was using jackd2 for ages, never had this issue. The usual limits.conf
  tweaks are present. Jackd won't run in realtime even as root. It's
  very easy to reproduce in Focal.

  Before upgrade, was working:
  Ubuntu 18.04.4 LTS
  uname -r
  kernel 5.3.0-51-generic
  jackd --version
  jackdmp version 1.9.12 tmpdir /dev/shm protocol 8

  After upgrade:
  Ubuntu 20.04 LTS
  uname -r
  5.4.0-29-generic
  jackd --version
  jackdmp version 1.9.12 tmpdir /dev/shm protocol 8

  
  Simple test:
  jackd -R -d dummy -r192000 -p2048

  jackdmp 1.9.12
  Copyright 2001-2005 Paul Davis and others.
  Copyright 2004-2016 Grame.
  Copyright 2016-2017 Filipe Coelho.
  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 RT messagebuffer thread: Operation not permitted (1)
  Retrying messagebuffer thread without RT scheduling
  Messagebuffer not realtime; consider enabling RT scheduling for user
  no message buffer overruns
  Cannot create RT messagebuffer thread: Operation not permitted (1)
  Retrying messagebuffer thread without RT scheduling
  Messagebuffer not realtime; consider enabling RT scheduling for user
  no message buffer overruns
  Cannot create RT messagebuffer thread: Operation not permitted (1)
  Retrying messagebuffer thread without RT scheduling
  Messagebuffer not realtime; consider enabling RT scheduling for user
  no message buffer overruns
  JACK server starting in realtime mode with priority 10
  self-connect-mode is "Don't restrict self connect requests"
  Cannot use real-time scheduling (RR/10)(1: Operation not permitted)
  AcquireSelfRealTime error

  I'm guessing that it's not jack itself (package ver. seems to be the
  same as bionic, without new feats), smth is missing in the kernel
  config. I would try RT kernel, but it usually does not boot at all
  thanks to Nvidia blob on that system.

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