[LAU] jackd does not start

[Kaj Ailomaa]

On Sun, 31 Mar 2013 13:43:43 +0200, <jonetsu at teksavvy.com> wrote:

> Hello everyone,
>
> To my surprise, jackd could not start this morning (using
> qjackctl).
>
> User name was added to the audio group. The audio devices are:
>
> % cat /proc/asound/cards
>
>   0 [PCH            ]: HDA-Intel - HDA Intel PCH
>                        HDA Intel PCH at 0xf7d10000 irq 53
>
>   1 [M1010LT        ]: ICE1712 - M Audio Delta 1010LT
>                        M Audio Delta 1010LT at 0xd040, irq 18
>
> Interface in qjackctl is specified as 'hw:M1010LT'
>
> Here's what happened:
>
>   Sun Mar 31 07:37:23 2013: JACK server starting in realtime mode
>   with priority 10
>
>   Cannot connect to server socket err = No such file or directory
>
>   Cannot connect to server request channel
>
>   jack server is not running or cannot be started
>
>   Sun Mar 31 07:37:23 2013: ERROR: Failed to acquire
>   device name : Audio1 error : Method "RequestRelease" with
>   signature "i" on interface "org.freedesktop.ReserveDevice1"
>   doesn't exist
>

I would bet you are using the same device with pulseaudio. Pulseaudio is  
supposed to let go of the card when you start jack, but this is not  
working properly. Fixed in pulseaudio-3.0 (Ubuntu 13.04).
There are a few ways to get around this.

First of all, in a clean session, make sure pulseaudio is not using your  
device when you start jack. I mean nothing. no open bwowser tabs with  
flash video, etc. This usually works.
Once jack is started, you can have pulseaudio connect to jack (if you have  
pulseaudio-module-jack installed, and you started jackdbus), by setting  
jack as the output in the pulseaudio mixer.
If you don't want pulseaudio connect to jack, you should probably either..

Set pulseaudio to use another device than what you want jack to use

Use the command "pasuspender -- qjackctl" making pulseaudio suspend when  
starting qjackctl.

Set pulseaudio to not autospawn in /etc/pulse/client.conf, then kill  
pulse. Then start jack.