MONO VOLUME REGISTER Index 0x06 This register controls the mono output
volume and mute bit. The volume register contains five bits, generating
32 volume levels with 31 steps of 1.5 dB each

Simple mixer control 'Master',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 0 [0%] [-46.50dB] [off]
  Front Right: Playback 0 [0%] [-46.50dB] [off]
Simple mixer control 'Master Mono',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 31
  Mono: Playback 31 [100%] [0.00dB] [on]
Simple mixer control 'Headphone',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 31 [100%] [0.00dB] [on]
  Front Right: Playback 31 [100%] [0.00dB] [on]


if your thinkpad speaker is stereo, only master volume control the volume 

master mono only affect subwoofer of some notebook

master volume get muted when pulseaudio select analog-mono as active
port

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-output-mono.conf

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https://bugs.launchpad.net/bugs/1214670

Title:
  [ICH4 - Intel ICH6, playback] No sound at all

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