amixer

Simple mixer control 'Line in',0
  Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 255
  Front Left: Capture 207 [81%] [on]
  Front Right: Capture 207 [81%] [on]
Simple mixer control 'Mic',0
  Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 255
  Front Left: Capture 0 [0%] [off]
  Front Right: Capture 0 [0%] [off]
Simple mixer control 'Phone',0
  Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 255
  Front Left: Capture 207 [81%] [off]
  Front Right: Capture 207 [81%] [off]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'IEC958 Center/LFE',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 106 [42%]
  Front Right: Playback 106 [42%]
Simple mixer control 'IEC958 Front',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 95 [37%]
  Front Right: Playback 95 [37%]
Simple mixer control 'IEC958 Rear',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 115 [45%]
  Front Right: Playback 115 [45%]
Simple mixer control 'IEC958 Unknown',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 100 [39%]
  Front Right: Playback 100 [39%]
Simple mixer control 'Aux',0
  Capabilities: cvolume cswitch cswitch-joined cswitch-exclusive
  Capture exclusive group: 0
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 255
  Front Left: Capture 207 [81%] [off]
  Front Right: Capture 207 [81%] [off]
Simple mixer control 'Analog Center/LFE',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 105 [41%]
  Front Right: Playback 105 [41%]
Simple mixer control 'Analog Front',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 100 [39%]
  Front Right: Playback 100 [39%]
Simple mixer control 'Analog Rear',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 20 [8%]
  Front Right: Playback 20 [8%]
Simple mixer control 'Analog Side',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 15 [6%]
  Front Right: Playback 15 [6%]
Simple mixer control 'CAPTURE feedback',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 174 [68%]
  Front Right: Playback 174 [68%]
Simple mixer control 'Digital Capture Source',0
  Capabilities: enum
  Items: 'IEC958 out' 'i2s mixer out' 'IEC958 in' 'i2s in' 'AC97 in' 'SRC out'
  Item0: 'i2s in'
Simple mixer control 'Shared Mic/Line in',0
  Capabilities: enum
  Items: 'Line in' 'Mic in'
  Item0: 'Line in'