#查看声卡
root@yu-Lenovo-Flex-2-14:~#aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 10: HDMI 4 [HDMI 4]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: ALC233 Analog [ALC233 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
#设置默认声卡，我的HDMI外接屏幕没有喇叭，所以设置笔记本内置的声卡为默认声卡，声卡编号为1。
#需要在/etc/下新建一个文件asound.conf，文件内容如下
root@yu-Lenovo-Flex-2-14:~# cat /etc/asound.conf
defaults.ctl.card 1
defaults.pcm.card 1
defaults.timer.card 1
#进入用户主目录
cd ~
#将/etc/asound.conf复制到用户主目录下，并重命名为.asoundrc
cp /etc/asound.conf ./.asoundrc
#重启电脑即可
