[PlanetCCRMA] Problem running audio through jack

Reyort, Nav tennen_funk at hotmail.com
Wed Jun 4 13:53:19 PDT 2008

Hello Fernando,

Yes, the sound card on my computer is hda-intel.
When I tried 3 periods instead of 2, I hear clean sine tone from audio output now.

I tried running the command

jackd -R -d alsa -d hw -n 3

And terminal returned me following messages:
jackd 0.109.2
Copyright 2001-2005 Paul Davis and others.
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 ..
SSE2 detected
creating alsa driver ... hw|hw|1024|3|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 32bit little-endian
ALSA: use 3 periods for capture
ALSA: final selected sample format for playback: 32bit little-endian
ALSA: use 3 periods for playback
Does this mean jack is working properly?
Is there anywhere I can find document about jack so I can learn what all the parameters and set up work?

> From: nando at ccrma.Stanford.EDU
> To: tennen_funk at hotmail.com
> Date: Wed, 4 Jun 2008 12:45:28 +0200
> CC: planetccrma at ccrma.Stanford.EDU
> Subject: Re: [PlanetCCRMA] Problem running audio through jack
> On Wed, 2008-06-04 at 08:49 +0000, Reyort, Nav wrote:
>> Hello,
>> I am having trouble tuning up the audio with jack.
>> I do get a sound out of jack,
>> but testing the audio output results in glitchy sound 
>> and extra noise is heard from output together with test sine tone.
>> I used pd and supercollider to test the audio, but both resulted in similar
>> result. Does anyone have any idea in how to properly run audio through jack?
>> The system I am using is Fedora 8 and kernel version is
>> If you need any additional information from me, please let me know.
> What soundcard to you have? And what parameters are you using to run it
> from jack? If it is an hda-intel then you should try with 3 periods
> instead of 2...
> What happens if you run jack like this from a terminal?:
>   jackd -R -d alsa -d hw -n 3
> -- Fernando
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> PlanetCCRMA at ccrma.stanford.edu
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