aplay : unable to open slave

設定預設音效裝置

$ aplay -l

card 0: PCH [HDA Intel PCH], device 0: CX20590 Analog [CX20590 Analog]
  Subdevices: 1/1
  Subdevice #1: subdevice #0

一般爲 Analog 那一個 

# vi /etc/asound.conf
defaluts.pcm.card 1
defaults.pcm.device 0
defaults.ctl.card 1

pcm.!default {
    type plug
    slave.pcm "hw:1,0"
}

References :
ALSA で snd_pcm_dmix_open が unable to open slave になる場合 | 衣谷止の開発日誌