[Jack-Devel] (no subject)

Tom Law tomlaw at bigsphinx.com
Sun Aug 7 06:12:10 CEST 2016

I just installed Ubuntu trusty (on crouton on an Acer Chromebook), and am
trying to get sound going (so I can run Super-Collider.)

Upon the advice of various webpages I've come across that discuss
installation of Super-Collider, I've tried:

   - removing pulseaudio
   - adding myself to the "hwaudio" group
   - adding '@audio' entries to /etc/security/limits.conf

But I always get "Could not connect to JACK server as client" when I run

This is the output I get when I run qjackctl.   I've tried changing the
interface to both 'cras' and 'hw:DAISY12S', but neither work.

23:54:23.518 Patchbay deactivated.

23:54:23.585 Statistics reset.

23:54:23.598 ALSA connection change.

23:54:23.643 D-BUS: Service not available (org.jackaudio.service aka

23:54:23.667 JACK is starting...

23:54:23.668 /usr/bin/jackd -dalsa -dcras -r44100 -p1024 -n2

23:54:23.686 ALSA connection graph change.

jackd 0.122.0

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 compiled with System V SHM support.

loading driver ..

apparent rate = 44100

creating alsa driver ... cras|cras|1024|2|44100|0|0|nomon|swmeter|-|32bit

Couldn't connect to cras.

control open "cras" (Operation not permitted)

configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods

ALSA: final selected sample format for capture: 32bit integer little-endian

ALSA: use 2 periods for capture

ALSA: cannot set hardware parameters for capture

ALSA: cannot configure capture channel

cannot load driver module alsa

(qjackctl:13298): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion
'GTK_IS_WIDGET (widget)' failed

(qjackctl:13298): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion
'GTK_IS_WIDGET (widget)' failed

23:54:23.980 JACK was started with PID=13310.

23:54:24.042 JACK was stopped successfully.

My apologies if I'm asking this in the wrong place, or if I'm not giving
enough info.  I'll ask elsewhere if that's more appropriate.   But any
advice or suggestions would be much appreciated!
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