声音

sudo apt-get install alsa-base alsa-utils alsa-oss alsa-tools

alsamixer

查看音频系统

查看驱动提供的接口

$ amixer contents
numid=1,iface=CARD,name='HDMI/DP,pcm=3 Jack'
numid=7,iface=CARD,name='HDMI/DP,pcm=7 Jack'
numid=13,iface=CARD,name='HDMI/DP,pcm=8 Jack'
numid=2,iface=MIXER,name='IEC958 Playback Con Mask'
numid=8,iface=MIXER,name='IEC958 Playback Con Mask',index=1
numid=14,iface=MIXER,name='IEC958 Playback Con Mask',index=2
numid=3,iface=MIXER,name='IEC958 Playback Pro Mask'
numid=9,iface=MIXER,name='IEC958 Playback Pro Mask',index=1
numid=15,iface=MIXER,name='IEC958 Playback Pro Mask',index=2
numid=4,iface=MIXER,name='IEC958 Playback Default'
numid=10,iface=MIXER,name='IEC958 Playback Default',index=1
numid=16,iface=MIXER,name='IEC958 Playback Default',index=2
numid=5,iface=MIXER,name='IEC958 Playback Switch'
numid=11,iface=MIXER,name='IEC958 Playback Switch',index=1
numid=17,iface=MIXER,name='IEC958 Playback Switch',index=2
numid=6,iface=PCM,name='ELD',device=3
numid=19,iface=PCM,name='Playback Channel Map',device=3
numid=12,iface=PCM,name='ELD',device=7
numid=20,iface=PCM,name='Playback Channel Map',device=7
numid=18,iface=PCM,name='ELD',device=8
numid=21,iface=PCM,name='Playback Channel Map',device=8

查看所有的配置

$ amixer contents

numid=1,iface=CARD,name='HDMI/DP,pcm=3 Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=7,iface=CARD,name='HDMI/DP,pcm=7 Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=13,iface=CARD,name='HDMI/DP,pcm=8 Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off
numid=2,iface=MIXER,name='IEC958 Playback Con Mask'
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0xff AES2=0x00 AES3=0x00]
numid=8,iface=MIXER,name='IEC958 Playback Con Mask',index=1
  ; type=IEC958,access=r-------,values=1
  : values=[AES0=0x0f AES1=0xff AES2=0x00 AES3=0x00]

简单设置

查看简单接口

$ amixer scontrols
Simple mixer control 'IEC958',0
Simple mixer control 'IEC958',1
Simple mixer control 'IEC958',2

$ amixer scontents
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'IEC958',1
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'IEC958',2
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

gnome-alsamixer

sudo apt-get install gnome-alsamixer