[LAD] JACK and vanilla 3.19.2 startup issue

Harry van Haaren harryhaaren at gmail.com
Sat Apr 4 17:08:25 UTC 2015

Hi All,

As root, starting JACK1 0.124.1 on an almost totally vanilla
3.19.2-1-ARCH kernel fails. Output of kernel with JACK1 issue is
pasted below[1]. The same system works fine with the 3.18.9-rt5-1-rt

Running "groups" tells me there is no group other than "root", so JACK
seems to misinterpret that there is an audio group on the "broken"

Any suggestions as to what's going on? Thanks, -Harry

PS: I'm aware of the reasons to not run JACK as the root user or login
as root for daily use.

[1] Output while running "broken" kernel:
[root at audio ~]# jackd -ddummy
jackd 0.124.1
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben
Hohn and others.
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

JACK is running in realtime mode, but you are not allowed to use
realtime scheduling.

Your system has an audio group, but you are not a member of it.
Please add yourself to the audio group by executing (as root):
  usermod -a -G audio (null)

After applying these changes, please re-login in order for them to take effect.

You don't appear to have a sane system configuration. It is very likely that you
encounter xruns. Please apply all the above mentioned changes and
start jack again!

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