#9920 NORM 1.5-sof: os64 record activity audio recording level very low

[Zarro Boogs per Child]

#9920: os64 record activity audio recording level very low
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           Reporter:  Quozl            |       Owner:  dsd                               
               Type:  defect           |      Status:  new                               
           Priority:  normal           |   Milestone:  1.5-software-later                
          Component:  record-activity  |     Version:  1.5 Software Build os64 aka 10.1.0
         Resolution:                   |    Keywords:  os64 os121                        
        Next_action:  never set        |    Verified:  0                                 
Deployment_affected:                   |   Blockedby:                                    
           Blocking:                   |  
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Comment(by Quozl):

 The ''Digital'' mixer control only appears once a capture has been
 started.  Test: boot, monitor amixer, then start arecord.

 The ''PCM'' mixer control only appears once a playback stream has been
 started.  Test: boot, monitor amixer, then start aplay.

 Perhaps it has something to do with the power saving modes we have
 selected.

 The kernel on os121 has these set:
 {{{
 CONFIG_SND_HDA_INTEL=y
 CONFIG_SND_HDA_HWDEP=y
 CONFIG_SND_HDA_RECONFIG=y
 CONFIG_SND_HDA_CODEC_CONEXANT=y
 CONFIG_SND_HDA_GENERIC=y
 CONFIG_SND_HDA_POWER_SAVE=y
 CONFIG_SND_HDA_POWER_SAVE_DEFAULT=5
 }}}

 The ''Digital'' mixer control appears to be an additional attenuator in
 the path from the microphone to user-space during a capture.  Both it and
 the ''Capture'' control determine the amplitude of the captured waveform.

-- 
Ticket URL: <http://dev.laptop.org/ticket/9920#comment:5>
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