>
> > I have heard of this problem before and thought that a faulty
> headset was
> > the problem but it seems that you have eliminated that. What
> type of sound
> > card is this?
> >
> > I think many of us would be interested in your diagnosis and
> resolution to
> > this problem so if you find anything keep us up to date.
> >
> >
> [Fennell, Michael] Still looking into it when I have the time. The
> sound card is on the motherboard. It's a Crystal Semiconductor
> CS4236 chip
> set.
>
> The echo goes away when I use half-duplex or uncheck the microphone
> in the NM GUI. Disabling DirectSound using NM has no effect.
>
I think that pretty well eliminates direct sound - I wouldn't bother trying
anything else.
I would look at the audio mixer -- make sure it is configured with only the
mic in the record mix. It may be that the drivers for the sound card do not
correctly implement full duplex.
Another sound card or later drivers might solve that.
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