ALSA output error (snd_pcm_open): Device or resource busy?

["Peter P." <peterparker@xxxxxxxxxxxx>]

Hi list,

wanting to output audio from two applications at the same time using
ALSA and not ~/.asoundrc in place, I am getting the following error for
the second application (mpv) wanting to access the soundcard:

	ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
	[ao/alsa] Playback open error: Device or resource busy
	[ao] Failed to initialize audio driver 'alsa'
	Could not open/initialize audio device -> no sound.

Querying my system for devices using $ arecord -L I get (amongst other
interfaces and cards):
	default
	hw:CARD=PCH,DEV=0
    	    HDA Intel PCH, ALC269VC Analog
    	    Direct hardware device without any conversions
	plughw:CARD=PCH,DEV=0
    	    HDA Intel PCH, ALC269VC Analog
    	    Hardware device with all software conversions
I remember that the hw: devices may not allow simultaneous access, but
the plughw: might. So will it help to declare the plughw:CARD=PCH,DEV=0
as the "default", and how would I go about to do so?

https://www.alsa-project.org/wiki/Asoundrc indicates I should setup dmix
but I somehow wonder if/why the above doesn't work out of the box
without an .asoundrc?

Thanks for all ideas!
Peter
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