Re: [Alsa-user] "Unknown field slaves" with virtual multi-channel device [SOLVED]

[Sheldon H. <she...@st...>]

On Wed, Feb 13, 2013 at 4:49 PM, Clemens Ladisch
<cla...@go...> wrote:
> Sheldon Hearn wrote:
>> ALSA lib pcm_hw.c:1466:(_snd_pcm_hw_open) Unknown field slaves
>
> The function _snd_pcm_hw_open is the "hw" plugin.
> Apparently, you have changed its definition somewhere.

Ah, I get it now. It's now that I've redefined the hw plugin, it's
that I've redefined my virtual multi-channel device as hw.

And there it was staring me in the face:

pcm.multi {
  type multi;
  slaves.a.pcm "hw:0,0";
  [...]
}

pcm.multi {
  type hw;
  card 0;
}

The second pcm.multi stanza redefines the device called multi using
the hw plugin. invalidating the configuration statements in the first
stanza.

This was a typo in my adaptation from the example in the
documentation. The second stanza should have been:

ctl.multi {
  type hw;
  card 0;
}

Thanks for the help, and sorry it took me so long to absorb. :-)

Ciao,
Sheldon.