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[Raymond <1078704@xxxxxxxxxxxxxxxxxx>]

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 whenever the
D5 or D13 bits are set to 1, their respective lower five volume bits are
automatically set to 1 by the codec logic. On readback, all lower five
bits read 1s whenever these bits are set to 1. Refer to Table 12 for
examples.


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. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 bits are set to 1, their respective lower five volume bits are automatically set to 1 by the codec logic. On readback, all lower five bits read 1s whenever these bits are set to 1. Refer to Table 12 for examples.  


this is quite different from those virtual master of hda codecs

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https://bugs.launchpad.net/bugs/1078704

Title:
  headphone jack sense not enabled

Status in ALSA driver:
  Confirmed
Status in alsa-driver package in Ubuntu:
  New
Status in pulseaudio package in Ubuntu:
  New

Bug description:
  bug is present in Ubuntu 12.04 and Xubuntu 12.04 and Lubuntu 12.04.1 64bit 
  alsa-base 1.0.25+dfsg-0ubuntu1 on this machine (64 bit)
  I except Ubuntu to automatically sense the presence of headphones and disable the speakers.  This is not the case, the speakers and headphones play simultaneously.  I must install gnome-alsamixer to manually set the jack sense.  Alsa should have this enabled as the default setting.  This seems as though it should be a very easy bug to fix, though.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
  Uname: Linux 3.2.0-32-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  love       1330 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'nForce3'/'NVidia nForce3 with AD1981B at irq 21'
     Mixer name	: 'Analog Devices AD1981B'
     Components	: 'AC97a:41445374'
     Controls      : 33
     Simple ctrls  : 22
  Date: Wed Nov 14 06:42:21 2012
  InstallationMedia: Lubuntu 12.04 "Precise Pangolin" - Release amd64 (20120423)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/30/2004
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.11
  dmi.board.name: 08A0
  dmi.board.vendor: Compal
  dmi.board.version: 32.22
  dmi.chassis.type: 10
  dmi.chassis.vendor: Compal
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.11:bd04/30/2004:svnHewlett-Packard:pnPresarioR3200(PF153UA#ABA):pvrF.11:rvnCompal:rn08A0:rvr32.22:cvnCompal:ct10:cvr:
  dmi.product.name: Presario R3200 (PF153UA#ABA)
  dmi.product.version: F.11
  dmi.sys.vendor: Hewlett-Packard

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