运行alsamixer,出现cannot open mixer: ... 解决方案如下:
(1)查看声卡
aplay -l
(2)修改配置文件
sudo nano /etc/modprobe.d/alsa-base.conf
写入以下内容
# This sets the index value of the cards but doesn't reorder. options snd_usb_audio index=0 options snd_bcm2835 index=1 # Does the reordering. options snd slots=snd_usb_audio,snd_bcm2835
(3)重启,搞定