Arch Linux

sweiss

Member

Registered: 2004-02-16

Posts: 635

JACK trouble

Hello.
When I execute qjackctl and press the Start button, I get the following error from JACK:

12:31:55.710 jackd -R -dalsa -dhw:0 -r48000 -p1024 -n2
12:31:55.713 JACK was started with PID=13711 (0x358f).
jackd 0.103.0
Copyright 2001-2005 Paul Davis and others.
jackd 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
JACK compiled with POSIX SHM support.
cannot open existing shm registry segment (Permission denied)
no access to shm registry
12:31:55.725 JACK was stopped with exit status=3.

Any ideas why this is happening?

Thanks.

---

Some PKGBUILDs: http://members.lycos.co.uk/sweiss3

rossm

Member

From: Australia/Melbourne

Registered: 2006-09-25

Posts: 15

Re: JACK trouble

Hi there,
I hope somebody knows the answer to this as I am having exactly the same problem.

Hello.
When I execute qjackctl and press the Start button, I get the following error from JACK:

12:31:55.710 jackd -R -dalsa -dhw:0 -r48000 -p1024 -n2
12:31:55.713 JACK was started with PID=13711 (0x358f).
jackd 0.103.0
Copyright 2001-2005 Paul Davis and others.
jackd 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
JACK compiled with POSIX SHM support.
cannot open existing shm registry segment (Permission denied)
no access to shm registry
12:31:55.725 JACK was stopped with exit status=3.

Any ideas why this is happening?

Thanks.

I know it must be a permissions thing as I can qjackctl as root and it works fine. My user is in group audio so its not that.??

Last edited by rossm (2007-06-16 02:56:26)

nick122147

Member

Registered: 2007-05-17

Posts: 33

Re: JACK trouble

are you in the audio group?

shinlun

Member

From: Taipei, Taiwan

Registered: 2007-05-16

Posts: 61

Re: JACK trouble

If you used "root" or a different account to start jack before, you might see this error message. Look under /dev/shm/, delete jack-shm-registry using root, and try again. Hope this helps

rossm

Member

From: Australia/Melbourne

Registered: 2006-09-25

Posts: 15

Re: JACK trouble

I think I have got this sussed. I downloaded  realtek-linux-audiopack-4.0.6a.tar.bz2 from http://www.realtek.com.tw/downloads/dow … Down=false
and installed it which enabled the midi passthrough interfaces on the VIA HDA 82xx/ALC888 soundchip and my problems went away.

This is only alsa with a different config. There must be differences in the configuration but I don't know enough to be able to suggest to devs how to deal with this. Maybe someone could make an alternative alsa package in the AUR.

Anyhoo. My sound now works heaps better even though it is a messy way to do it.

Regards Ross