alsa-project/alsa-lib issue #405 was opened from DocMAX:
```
a52:CARD=Adapter
USB SPDIF Adapter
Plugin to convert multichannel stream to A52 (AC3) bitstream
[root@desktop ~]# speaker-test -c6 -Da52
speaker-test 1.2.12
Playback device is a52
Stream parameters are 48000Hz, S16_LE, 6 channels
Using 16 octaves of pink noise
ALSA lib pcm_rate.c:1701:(_snd_pcm_rate_open) Unknown field card
Playback open error: -22,Invalid argument
```
how to fix this error?
running arch linux all updated
Issue URL : https://github.com/alsa-project/alsa-lib/issues/405
Repository URL: https://github.com/alsa-project/alsa-lib
