[linux-audio-user] noisy capture->playback

David dplist at free.fr
Sun Nov 2 13:07:39 EST 2003

On 02 Nov 2003 09:48:44 -0600
Jan Depner <eviltwin69 at cableone.net> wrote:

> I'm not sure I'm following this.  How have you got envy24control set
> up?  Are H/W Out 1/2 set to PCM Out 1/2 or Digital Mix L/R?  I've had
> a problem that sounds similar when using the Digital Mix L/R combo.  I
> found that muting all of the channels except PCM Out 1/2 cleared it
> up. I think it was that PCM Out 1/2 were being overdriven.

I hear no noise when I set H/W Out 1/2 the right H/W In (straight input
monitoring) or when I set H/W Out 1/2 the Digital Mixer (after unmuting
and raising the level of the input channel of course).

Bad noise comes when I set H/W Out 1/2 to PCM Out 1/2 and connect using
jackd the alsa capture port (that map to a H/W In) to the alsa playback
port 1/2 (that maps to PCM Out 1/2).

Is this a better description ?

I've just upgraded my kernel to 2.4.22+ll and alsa to 0.9.8 but this did
not change the situation.

> Jan

Thanks for answering.


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