Re: Two sound cards, only sound out of one

[Takashi Iwai <tiwai@suse.de>]

At Fri, 29 Aug 2003 13:21:14 +1000,
Erik de Castro Lopo wrote:
> 
> > i'd
> > suspect it's a hardware issue.  i.e. mixer mutes or physical
> > connection.  to check the card's playback without physical connection,
> > you can record via loopback like the following procedure:
> > 
> > 1. choose "Mix" as the capture source.
> > 2. turn on "Capture" switch.
> > 3. raise "Capture" volume.
> > 4. adjust "PCM" and "Master" volumees and switches.
> > 5. play a file and record at the same time.
> > 6. check the recorded file
> 
> I'm not really sure how to do all this but it does seem like a good 
> debugging method. Could you be a little bit more explicit about how 
> the above steps are carried out?

the method above will give you recording the signals you're playing
through the loopback from DAC.  thus, you can check whether signal
comes out without the physical cable connection (i.e. one less
artificial possible mistake).

this method is generally available on every ac97 codec.


Takashi


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