Fwd: jackd can't find backend

[Mickey]

FC13/KDE

I having problems with jackd not starting, because it can't find a backend

Which one do I use pulseaudio or alsa ?

There is no output in /var/log/messages for jackd.

Here is the output of running "jackd"

$ jackd
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 
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

jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 
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

usage: jackd [ --no-realtime OR -r ]
              [ --realtime OR -R [ --realtime-priority OR -P priority ] ]
       (the two previous arguments are mutually exclusive. The default 
is --realtime)
              [ --name OR -n server-name ]
              [ --no-mlock OR -m ]
              [ --unlock OR -u ]
              [ --timeout OR -t client-timeout-in-msecs ]
              [ --port-max OR -p maximum-number-of-ports]
              [ --debug-timer OR -D ]
              [ --no-sanity-checks OR -N ]
              [ --verbose OR -v ]
              [ --clocksource OR -c [ c(ycle) | h(pet) | s(ystem) ]
              [ --replace-registry ]
              [ --silent OR -s ]
              [ --version OR -V ]
              [ --nozombies OR -Z ]

-d backend [ ... backend args ... ]
              Available backends may include: alsa, dummy, freebob, 
firewire, net, oss, sun, or portaudio.

jackd -d backend --help
              to display options for each backend

[mickey@Acer ~]$ jackd -d backend --help
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 
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

jackd: unknown driver 'backend'

# jackd -d pulseaudio
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 
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

jackd: unknown driver 'pulseaudio'

[root@Acer mickey]# jackd -d alsa
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 
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 System V SHM support.
loading driver ..
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0
the playback device "hw:0" is already in use. Please stop the 
application using it and run JACK again

cannot load driver module alsa

There are no other applications using the sound system.

jackd can't find backend

[Samuel Kidman]

> [root@Acer mickey]# jackd -d alsa
> jackd 0.118.0
> Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
> 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 System V SHM support.
> loading driver ..
> creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
> control device hw:0
> the playback device "hw:0" is already in use. Please stop the application
> using it and run JACK again
>
> cannot load driver module alsa
>
> There are no other applications using the sound system.

Have you tried starting jackd just after login? Even if an application is
not making any audible sounds it can still using the sound card. firefox
does this.

Also I think you need to edit your /etc/asound.conf file to set up jack
properly. I haven't been able to get this to work properly either. I can get
jark started and running ok, but then I can't get it to make a sound.

Sam

[John Wendel]

On 09/29/2010 10:01 AM, Jim wrote:
> FC13/KDE
>
> I having problems with jackd not starting, because it can't find a backend
>
> Which one do I use pulseaudio or alsa ?
>
> There is no output in /var/log/messages for jackd.
>
> Here is the output of running "jackd"
>
> $ jackd
> jackd 0.118.0
> Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
> 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
>
> jackd 0.118.0
> Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
> 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
>
> usage: jackd [ --no-realtime OR -r ]
> [ --realtime OR -R [ --realtime-priority OR -P priority ] ]
> (the two previous arguments are mutually exclusive. The default is
> --realtime)
> [ --name OR -n server-name ]
> [ --no-mlock OR -m ]
> [ --unlock OR -u ]
> [ --timeout OR -t client-timeout-in-msecs ]
> [ --port-max OR -p maximum-number-of-ports]
> [ --debug-timer OR -D ]
> [ --no-sanity-checks OR -N ]
> [ --verbose OR -v ]
> [ --clocksource OR -c [ c(ycle) | h(pet) | s(ystem) ]
> [ --replace-registry ]
> [ --silent OR -s ]
> [ --version OR -V ]
> [ --nozombies OR -Z ]
>
> -d backend [ ... backend args ... ]
> Available backends may include: alsa, dummy, freebob, firewire, net,
> oss, sun, or portaudio.
>
> jackd -d backend --help
> to display options for each backend
>
> [mickey@Acer ~]$ jackd -d backend --help
> jackd 0.118.0
> Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
> 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
>
> jackd: unknown driver 'backend'
>
> # jackd -d pulseaudio
> jackd 0.118.0
> Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
> 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
>
> jackd: unknown driver 'pulseaudio'
>
> [root@Acer mickey]# jackd -d alsa
> jackd 0.118.0
> Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn
> 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 System V SHM support.
> loading driver ..
> creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
> control device hw:0
> the playback device "hw:0" is already in use. Please stop the
> application using it and run JACK again
>
> cannot load driver module alsa
>
> There are no other applications using the sound system.

Do you have pulseaudio running? If so, stop it first, then run jackd -d 
alsa. You'll probably also need to make some config file changes, but 
jackd will tell you what to change. I'm still trying to learn this stuff 
myself.

Regards,

John