there are two amp at node 0x16 and 0x1a in green line out Jack path from
node 0x10 to node 0x1a

dB range is sum of pcm playback volume and front playback volume

not sure why pulseaudio use 8.5dB as Max since dB Max of pcm playback
volume is 14 dB

Node 0x16 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
  Control: name="PCM Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="PCM Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Rear Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Rear Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Front Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Control: name="Front Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Control: name="Line Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=3, ofs=0
  Control: name="Line Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=3, ofs=0
  Control: name="CD Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Control: name="CD Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x06, mute=1
  Amp-In vals:  [0x18 0x18] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] 
[0x80 0x80]
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0
  Connection: 6
     0x10 0x1f 0x1a 0x1b 0x1e 0x25

Node 0x1c [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
  Control: name="Front Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Front Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Line Out Front Jack", index=0, device=0
  Amp-Out caps: ofs=0x1b, nsteps=0x1b, stepsize=0x06, mute=1
  Amp-Out vals:  [0x1b 0x1b]
  Pincap 0x0000001c: OUT HP Detect
  Pin Default 0x01014010: [Jack] Line Out at Ext Rear
    Conn = 1/8, Color = Green
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=02, enabled=1
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0
  Connection: 1
     0x16
Node 0x1d [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
  Control: name="Headphone Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Independent HP", index=0, device=0
  Control: name="Front Headphone Jack", index=0, device=0
  Amp-Out caps: ofs=0x1b, nsteps=0x1b, stepsize=0x06, mute=1
  Amp-Out vals:  [0x1b 0x1b]
  Pincap 0x0000001c: OUT HP Detect
  Pin Default 0x0221401f: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x1, Sequence = 0xf
  Pin-ctls: 0xc0: OUT HP
  Unsolicited: tag=01, enabled=1
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0
  Connection: 2
     0x16* 0x25

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https://bugs.launchpad.net/bugs/1210129

Title:
  Pulseaudio does not recognize sound levels correctly.

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