[pulseaudio-tickets] [PulseAudio] #213: PulseAudio 0.9.7 distorts audio (over amplification)

[PulseAudio]

#213: PulseAudio 0.9.7 distorts audio (over amplification)
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  Reporter:  valent  |       Owner:  lennart
      Type:  defect  |      Status:  new    
  Priority:  high    |   Milestone:         
 Component:  daemon  |    Severity:  major  
Resolution:          |    Keywords:         
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Comment (by valent):

 I got some great advice from Tanu Kaskinen on pulseaudio
 mailinglist.[[BR]]
 I have Conexant CX20549 (Venice)audio chip on my HP dv6426us
 "entertainment" laptop[[BR]]
 The issue was that this audio card does digital amplification on PCM
 channel and that distorts audio.[[BR]][[BR]]

 I started alsamixer and saw this:[[BR]]
 Master channel: 0-100% eaquals -64.50dB to 0dB gain[[BR]]
 PCM channel: 0-100% eaquals -30dB to +34.50dB gain[[BR]]
 When I lower PCM gain to 47% that eaquals 0dB gain.[[BR]][[BR]]

 Anything with positive gain is digital amplification and that leads to
 distortion! :([[BR]]
 Now I can have pulseaudio per application streams go to 100% without
 distortion![[BR]]
 [[BR]]
 Where should this be fixed? In pulseaudio? In alsamixes? Somewhere else?

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Ticket URL: <http://pulseaudio.org/ticket/213#comment:6>
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