Fwd: jackd can't find backend

[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 at 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 at 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