use hda-analyzer  to unmute the amp-in from 0x0f in the audio mixer 0x0b
(change from 0x80 to 0x00)

Node 0x0b [Audio Mixer] wcaps 0x200103: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x80 0x80] [0x00 0x00]
  Connection: 2
     0x0f 0x21

Node 0x03 [Audio Output] wcaps 0x405: Stereo Amp-Out
  Device: name="AD198x Analog", type="Audio", device=0
  Amp-Out caps: ofs=0x27, nsteps=0x27, stepsize=0x05, mute=0
  Amp-Out vals:  [0x27 0x27]
  Converter: stream=0, channel=0
  Power states:  D0 D3
  Power: setting=D0, actual=D0
Node 0x04 [Audio Output] wcaps 0x405: Stereo Amp-Out
  Amp-Out caps: ofs=0x27, nsteps=0x27, stepsize=0x05, mute=0
  Amp-Out vals:  [0x27 0x27]
  Converter: stream=0, channel=0
  Power states:  D0 D3
  Power: setting=D0, actual=D0


Node 0x0e [Audio Selector] wcaps 0x300101: Stereo
  Connection: 2
     0x03* 0x04
Node 0x0f [Audio Selector] wcaps 0x300101: Stereo
  Connection: 2
     0x03* 0x04


Node 0x16 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x00010037: IN OUT EAPD Detect Trigger ImpSense
  EAPD 0x2: EAPD
  Pin Default 0x92174110: [Fixed] Speaker at Int Front
    Conn = Analog, Color = Green
    DefAssociation = 0x1, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D3
  Power: setting=D0, actual=D0
  Connection: 1
     0x0b

Node 0x20 [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Control: name="PCM Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=5, ofs=0
  Control: name="PCM Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=5, ofs=0
  Control: name="Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Internal Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Control: name="Internal Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Control: name="Dock Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Control: name="Dock Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
  Amp-In vals:  [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] 
[0x17 0x17] [0x97 0x97]
  Connection: 7
     0x14 0x15 0x16 0x1a 0x25 0x03 0x04

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1100010

Title:
  PCI/internal sound card not detected ADI Soundmax AD1984A

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  Codec: Analog Devices AD1984A
  Codec: LSI ID 1040
  HP 6735s notebook/laptop
  Ubuntu 12.10 Quantal/Quetzal

  Speakers do work, but sound is scratchy, tinny and of poor quality. I
  would like to know if the speakers are damaged or something wrong with
  the sound card? When I ran ubuntu-bug -s audio I noticed that the tool
  didn't seem to pick up the codec or sound card. I know my speakers are
  black and attached to a green board. I hope I don't have to open it up
  again to check?! HP laptops are so not useful for hacking! Is there a
  way of finding out if the speakers are damaged or the driver not
  working right, without having to hack into it? Is there a better
  debugging tool you could guide me on?

  Any help or advice would be greatly appreciated. Thanks, Nick.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu3
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.6.1-0ubuntu9
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nick       1903 F.... pulseaudio
  Date: Tue Jan 15 12:31:18 2013
  InstallationDate: Installed on 2013-01-13 (2 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Title: PCI/internal sound card not detected
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/14/2009
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68GPP Ver. F.0E
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 30E4
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.20
  dmi.chassis.asset.tag: CNU8421ZNY
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68GPPVer.F.0E:bd09/14/2009:svnHewlett-Packard:pnHPCompaq6735s:pvrF.0E:rvnHewlett-Packard:rn30E4:rvrKBCVersion94.20:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq 6735s
  dmi.product.version: F.0E
  dmi.sys.vendor: Hewlett-Packard

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