Comment 12 for bug 1311525

> As a workaround I've disabled Pulse's control over PCM by adding

> load-module module-udev-detect ignore_dB=1

> to /etc/pulse/default.pa

volume: 0: 63% 1: 63%
         0: -12,00 dB 1: -12,00 dB
         balance 0,00
 base volume: 63%
              -12,00 dB

If pulseaudio ignore dB scale, do this mean it use full volume range ?

Do PCM Playback volume remain at 0dB all the time ?

do distortion occur when your application play to alsa device hw:0,0 directly when PCM playback volume is over 0dB ?

speaker-test -c2 -t wav -D hw:0,0

the capture volume also have +22.5dB gain and +12dB MIC Boost

control.17 {
  iface MIXER
  name 'Mic Boost (+20dB)
  value false
  comment {
   access 'read write'
   type BOOLEAN
   count 1
  }
 }

control.28 {
  iface MIXER
  name 'Capture Volume'
  value.0 15
  value.1 15
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 15'
   dbmin 0
   dbmax 2250
   dbvalue.0 2250
   dbvalue.1 2250
  }
 }

volume: 0: 100% 1: 100%
         0: 0,00 dB 1: 0,00 dB
         balance 0,00
 base volume: 42%
              -22,50 dB