From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: Have multiple opens removed on one device?
Date: Mon, 22 Aug 2011 12:15:58 +0200
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To: Scott Jiang <scott.jiang.linux@gmail.com>
Cc: alsa-devel@alsa-project.org, Mark Brown <broonie@opensource.wolfsonmicro.com>
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At Mon, 22 Aug 2011 18:13:03 +0800,
Scott Jiang wrote:
> 
> Hi Mark and Takashi,
> 
> In kernel 2.6.34 I can use aplay to play audio at the same time, alsa
> will mix the audio.

No, kernel part doesn't do such a thing.  If it's mixed, it must be
in the user-space (either dmix or a daemon like pulseaudio), unless
you hardware can do mixing by itself.

> Now the second open will return device busy.

So, something else must have been changed in your system...


Takashi