It seems that I have the exact same hardware config as Steven, and I happen to 
have the exact same problem.
There is a workaround for this when using pulseaudio.
In the file 
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf, comment 
the 2 lines below (around line 69):
[Element Speaker]
;switch = off
;volume = off

That solves the headphones muting.

Now, about the driver fix, I'm curious to know how I can do what you're
asking, Raymond.

Also, I've just realized that the subwoofer is not working.Pulseaudio only lets 
me choose analog stereo or surround 4.0.  Isn't it a related issue? 
I've tried a lot of parameters to the snd_hda_intel module, none appears to 
solve that. I don't know if I have the best driver's parameters but it looks 
like I have the same as Steven's since I have the same content for 
*_pin_configs sysfs files (I might be wrong, I don't know anything about the 
linux audio internals ; so, Steven, if you've managed to get the subwoofer 
working, I'm eager to know how!

Thanks.

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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/1056669

Title:
  [HP Pavilion dv7 Notebook PC, IDT 92HD81B1X5, Black Headphone Out,
  Front] No sound at all

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

Bug description:
  How do I disable auto-mute?

  I'm a ubuntu noob.

  Speakers work fine, but plugging in headphones = no audio. Take it out
  and speakers work fine again.

  Checked alsamixer, saw that the head phone jack was "muted" (MM) and 0.
  If I make it (00), and up the volume, the headphones work.

  Unplug headphones and plug back in, and it's muted once again (MM).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu2
  ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
  Uname: Linux 3.5.0-10-generic x86_64
  ApportVersion: 2.4-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  skymd      2009 F.... pulseaudio
   /dev/snd/pcmC0D0c:   skymd      2009 F...m pulseaudio
  Date: Wed Sep 26 00:13:57 2012
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Black Headphone Out, Front
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: No sound at all
  Title: [HP Pavilion dv7 Notebook PC, IDT 92HD81B1X5, Black Headphone Out, 
Front] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/21/2012
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.19
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 1800
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 10.59
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.19:bd05/21/2012:svnHewlett-Packard:pnHPPaviliondv7NotebookPC:pvr0690210000204620000620100:rvnHewlett-Packard:rn1800:rvr10.59:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion dv7 Notebook PC
  dmi.product.version: 0690210000204620000620100
  dmi.sys.vendor: Hewlett-Packard

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