Unable to open plughw:0,0 from user program.

[stan <stanl@cox.net>]

Hi,

I am unable to use plughw:0,0 as a device string while calling
err = snd_pcm_open (&alsa_dev, hw_from_default, SND_PCM_STREAM_PLAYBACK, 0);

The same call works with hw_from_default == 'default', but fails when it 
is 'plughw:0,0'.
The error is
cannot open audio device "plughw:0,0" (Device or resource busy)

I am using the latest snapshot of alsa-lib, alsa-lib20070821.  I tried 
debugging but I cannot trace through the macros.  As near as I can tell 
there have been no changes to alsa.conf, and this worked just fine 
before the latest upgrade alsa package alsa-lib.1.0.14-3

Is this a deliberate change in alsa that is known about, and is there a 
way to still get the functionality?

Thanks.