dave@dave-desktop:~$ amixer
Simple mixer control 'Headphone',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [off]
  Front Right: Playback [off]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 255 [100%]
  Front Right: Playback 255 [100%]
Simple mixer control 'Front',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 64
  Mono:
  Front Left: Playback 41 [64%] [on]
  Front Right: Playback 41 [64%] [on]
Simple mixer control 'Front Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65
  Mono:
  Front Left: Playback 45 [69%] [on]
  Front Right: Playback 45 [69%] [on]
Simple mixer control 'Surround',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 64
  Mono:
  Front Left: Playback 46 [72%] [on]
  Front Right: Playback 46 [72%] [on]
Simple mixer control 'Center',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 64
  Mono: Playback 46 [72%] [on]
Simple mixer control 'LFE',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 64
  Mono: Playback 46 [72%] [on]
Simple mixer control 'Side',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 64
  Mono:
  Front Left: Playback 64 [100%] [on]
  Front Right: Playback 64 [100%] [on]
Simple mixer control 'Line',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65
  Mono:
  Front Left: Playback 65 [100%] [on]
  Front Right: Playback 65 [100%] [on]
Simple mixer control 'CD',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65
  Mono:
  Front Left: Playback 65 [100%] [on]
  Front Right: Playback 65 [100%] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65
  Mono:
  Front Left: Playback 9 [14%] [on]
  Front Right: Playback 9 [14%] [on]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'PC Speaker',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65
  Mono:
  Front Left: Playback 65 [100%] [on]
  Front Right: Playback 65 [100%] [on]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 35
  Front Left: Capture 35 [100%] [on]
  Front Right: Capture 35 [100%] [on]
Simple mixer control 'Capture',1
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 35
  Front Left: Capture 35 [100%] [on]
  Front Right: Capture 35 [100%] [on]
Simple mixer control 'Capture',2
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 35
  Front Left: Capture 35 [100%] [on]
  Front Right: Capture 35 [100%] [on]
Simple mixer control 'Channel Mode',0
  Capabilities: enum
  Items: '6ch' '8ch'
  Item0: '6ch'
Simple mixer control 'Input Source',0
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line' 'CD'
  Item0: 'Line'
Simple mixer control 'Input Source',1
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line' 'CD'
  Item0: 'CD'
Simple mixer control 'Input Source',2
  Capabilities: enum
  Items: 'Mic' 'Front Mic' 'Line' 'CD'
  Item0: 'CD'