2 Dec
2007
2 Dec
'07
4:43 a.m.
I'm having problems with realtime in JACK in my newly installed Ubuntu 7.10.
If I start qjackctl as a normal user - even the user with "admin" privileges -
I cannot start the jack server in realtime mode. The error is:
cannot use real-time scheduling (FIFO at priority 10) [for thread -1210406208,
from thread -1210406208] (1: Operation not permitted)
But if I start qjackctl with sudo, realtime works fine.
I remember from my previous Gentoo system that I had to install modules
realtime and realtime-lsm, and the user had to be a member of group realtime.
But none of that seems to apply to Ubuntu, because it uses a specially
patched kernel; am I correct about that?
Output of uname -a is:
Linux peter-desktop 2.6.22-14-rt #1 SMP PREEMPT RT Mon Oct 15 01:05:51 GMT
2007 i686 GNU/Linux
The jackd command generated by qjackctl is:
/usr/bin/jackd -R -dalsa -r44100 -p1024 -n4 -D -Chw:0,0 -Phw:0,0 -s -S -i2 -o2
So my question is: how can I run jack as a normal user in Ubuntu?
Peter C
2 Dec
2 Dec
6:14 a.m.
Peter Clarke wrote:
I'm having problems with realtime in JACK in my
newly installed Ubuntu 7.10.
If I start qjackctl as a normal user - even the user with "admin" privileges -
I cannot start the jack server in realtime mode. The error is:
cannot use real-time scheduling (FIFO at priority 10) [for thread -1210406208,
from thread -1210406208] (1: Operation not permitted)
But if I start qjackctl with sudo, realtime works fine.
I remember from my previous Gentoo system that I had to install modules
realtime and realtime-lsm, and the user had to be a member of group realtime.
But none of that seems to apply to Ubuntu, because it uses a specially
patched kernel; am I correct about that?
Output of uname -a is:
Linux peter-desktop 2.6.22-14-rt #1 SMP PREEMPT RT Mon Oct 15 01:05:51 GMT
2007 i686 GNU/Linux
The jackd command generated by qjackctl is:
/usr/bin/jackd -R -dalsa -r44100 -p1024 -n4 -D -Chw:0,0 -Phw:0,0 -s -S -i2 -o2
So my question is: how can I run jack as a normal user in Ubuntu?
The easy way is to install the ubuntustudio packages that are part of
the normal ubuntu repository. apt-get install ubuntustudio-audio should
do the trick.
The thing to ensure is that your /etc/security/limits.conf contains
these lines:
@audio - rtprio 99
@audio - memlock 512000
@audio - nice -19
and that your user is part of the 'audio' group (it normally is by
default).
Normally the ubuntustudio packages take care of both these conditions.
Note that should you have to add the lines or make your user member of
the audio group, you have to logout and relogin in order for the changes
to take effect.
Greets,
Pieter
PS: While you're at it you can also install the realtime patched kernel
for ubuntu (linux-rt).
5 Dec
5 Dec
1:44 a.m.
I just had a similar experience.
I had installed the ubuntustudio-audio and audio-plugins metapackages
and linux-rt kernel on Fluxbuntu 7.10 RC. I got the same QJACKCtl
error. I had already made myself part of the audio group. I searched
the forums,found the tip about /etc/security/limits.conf and made
those changes, but still no success. Some further investigation showed
that QJACKCtlcould not access /dev/shm if I ran it as myself. If I ran
QJACKCtl using sudo, no problem.
Unfortunately that is where my investigation ended. I installed
Xubuntu and the ubuntustudio stuff and all is well.
I should probably post to the Fluxbuntu forum as well...
Best,
ernie
--
"Both Rob and I see sound as shapes.
I only have to do this (makes a fist)
and he knows what sound I mean". - Autechre
:::::::::::::::::::::::::::::::::::::::::::
Ernie Dulanowsky
www.pulsewidth.ca
So my question
is: how can I run jack as a normal user in Ubuntu?
The easy way is to install the ubuntustudio packages that are part of
the normal ubuntu repository. apt-get install ubuntustudio-audio should
do the trick.
The thing to ensure is that your /etc/security/limits.conf contains
these lines:
@audio - rtprio 99
@audio - memlock 512000
@audio - nice -19
and that your user is part of the 'audio' group (it normally is by
default).
Normally the ubuntustudio packages take care of both these conditions.
Note that should you have to add the lines or make your user member of
the audio group, you have to logout and relogin in order for the changes
to take effect.
Greets,
Pieter
PS: While you're at it you can also install the realtime patched kernel
for ubuntu (linux-rt). 
11:04 a.m.
i moved to fluxbuntu from ubuntu7.10
and now having the same problem
jackd installed via synaptic worked fine on ubuntu
did the same on fluxbuntu but the result is different
gee i love fluxbox ... is this a typical something for fluxbuntu?
On Dec 5, 2007 2:44 PM, Ernie Dulanowsky <ernst(a)pulsewidth.ca> wrote:
I just had a similar experience.
I had installed the ubuntustudio-audio and audio-plugins metapackages
and linux-rt kernel on Fluxbuntu 7.10 RC. I got the same QJACKCtl
error. I had already made myself part of the audio group. I searched
the forums,found the tip about /etc/security/limits.conf and made
those changes, but still no success. Some further investigation showed
that QJACKCtlcould not access /dev/shm if I ran it as myself. If I ran
QJACKCtl using sudo, no problem.
Unfortunately that is where my investigation ended. I installed
Xubuntu and the ubuntustudio stuff and all is well.
--
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http://micro.ispretty.com
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days inactive
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3 comments
4 participants
participants (4)
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'2+ -
Ernie Dulanowsky -
Peter Clarke -
Pieter Palmers