it is strange that dB are 0.20  in amixer since dB range of softvol is
-51 to 0

Simple mixer control 'PCM',0
  Capabilities: pvolume penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 254 [100%] [0.20dB]
  Front Right: Playback 254 [100%] [0.20dB]


        control.48 {
                iface MIXER
                name 'PCM Playback Volume'
                value.0 254
                value.1 254
                comment {
                        access 'read write user'
                        type INTEGER
                        count 2
                        range '0 - 255'
                        tlv '0000000100000008ffffec1400000014'
                        dbmin -5100
                        dbmax 0
                        dbvalue.0 -20
                        dbvalue.1 -20
                }

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https://bugs.launchpad.net/bugs/1127815

Title:
  [Asus P6X58-E PRO, Realtek ALC889, Green Line Out, Rear] Background
  noise or low volume

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