[Ardour-Users] jackd help?

Robin Gareus robin at gareus.org
Fri Aug 10 18:39:15 PDT 2012

On 08/11/2012 03:21 AM, Matt Zagrabelny wrote:
> Greetings,
> I am a relatively inexperienced jackd/ardour user - Debian Squeeze OS.
> ii  ardour-i686                          1:2.8.11-3
>     digital audio workstation (graphical gtk2 interface) [i686]
> ii  jackd2                               1.9.6~dfsg.1-2
>     JACK Audio Connection Kit (server and example clients)
> I used to have a functional ardour setup (on a mix of pre-Squeeze
> packages) for simple sound recordings and just bought a second hard
> disk to install Squeeze onto. I believe my success on the other hard
> drive must have been due to some amount of luck.
> I have a tape deck hooked up to the laptop's mic input (with RCA to
> 1/8" audio jack cable.) A portable music player's record functionality
> tells me that a signal is coming out, but when I plug into the laptop,
> I don't see anything in the meter.
> I am using qjackctl to spawn jackd and here is my .jackdrc (I grabbed
> this file off of the old hard disk.):
> /usr/bin/jackd -dalsa -dhw:0 -r48000 -p1024 -n2
> Here is the output of /proc/asound/devices
>   2:        : timer
>   3:        : sequencer
>   4: [ 0- 1]: digital audio playback
>   5: [ 0- 0]: digital audio playback
>   6: [ 0- 0]: digital audio capture
>   7: [ 0- 0]: hardware dependent
>   8: [ 0]   : control
> Any suggestions on how to debug jackd not seeing signal on the mic
> input on a laptop?
> Thanks for the help!
> -mz

Hi Matt,

Maybe it's as simple as the /Microphone muted in Mixer/.
"Open Volume Control -> Recording" from the desktop panel or run
"alsamixer" from the commandline + press <F4> Capture settings.

If that is OK, back off a step: Don't even start JACK and check if some
ALSA application (e.g. audacity of skype,..) can "hear" something on the

If it can, another cause of the problem could be pulseaudio interfering
with jackd. http://jackaudio.org/pulseaudio_and_jack

Most PPL concerned with pro-audio simply choose Option 1 and remove
pulseaudio completely -- on debian/squeeze that is usually done by
"sudo apt-get purge pulseaudio"


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