Why can't Alsa find the map?

Question

linux

Good day, when starting speaker-test , an error appears:

speaker-test 1.2.6

Playback device is default
Stream parameters are 48000Hz, S16_LE, 1 channels
Using 16 octaves of pink noise
ALSA lib pcm_dmix.c:1032:(snd_pcm_dmix_open) unable to open slave
Playback open error: -16,Device or resource busy

Can you please tell me how to make Alsa find this dmix?

Answer 1

First link on google