Comment 5 for bug 1183145

do you mean sound is distorted when master playback volume is over 0dB ?

!!Amixer output
!!-------------

!!-------Mixer controls for card 0 [Intel]

Card hw:0 'Intel'/'HDA Intel at 0xf4700000 irq 46'
  Mixer name : 'Analog Devices AD1981'
  Components : 'HDA:11d41981,103c309f,00100200 HDA:14f12bfa,103c309f,00090000'
  Controls : 13
  Simple ctrls : 9
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 63
  Mono:
  Front Left: Playback 49 [78%] [-18.00dB] [on]
  Front Right: Playback 49 [78%] [-18.00dB] [on]