refer to ad1981b AC97 coded datasheet

MASTER VOLUME REGISTER  Index 0x02 This register controls the Line_Out
volume controls for both stereo channels and the mute bit. Each volume
subregister contains five bits, generating 32 volume levels with 31
steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to
maintain compatibility


HEADPHONE VOLUME REGISTER  Index 0x04 This register controls the
headphone volume controls for both stereo channels and the mute bit.
Each volume subregister contains five bits, generating 32 volume levels
with 31 steps of 1.5 dB each

pulseaudio] alsa-mixer.c: Removing path 'analog-output' as it is a
subset of 'analog-output-headphones'.

this mean that pulseaudio cannot remove analog output path since it is
not a subset of headphone path

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https://bugs.launchpad.net/bugs/1214670

Title:
  [ICH4 - Intel ICH6, playback] No sound at all

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