refer to pulseaudio verbose log , your headphone seem quite normal

using hda-emu

> jack 0x1b 1
send: NID=0x1b, VERB=0x709(exec_pin_sense), PARM=0x0
receive: 0x0
send: NID=0x1b, VERB=0xf09(get_pin_sense), PARM=0x0
receive: 0x80000000
send: NID=0x14, VERB=0x707(set_pin_ctl), PARM=0x0
send: NID=0x15, VERB=0x707(set_pin_ctl), PARM=0x0
send: NID=0x16, VERB=0x707(set_pin_ctl), PARM=0x0
send: NID=0x17, VERB=0x707(set_pin_ctl), PARM=0x0

when headphone is plugged , driver set the pin ctls of  four line out
jacks to zero

CTL Notify: Front Headphone Jack:0, mask=1
JACK report Front Headphone, status 1
JACK report Rear Mic, status 0
JACK report Front Mic, status 0
JACK report Line, status 0
JACK report Line Out Front, status 0
JACK report Line Out Surround, status 0
JACK report Line Out CLFE, status 0
JACK report Line Out Side, status 0

driver update headphone jack status and send ctl notify to user space

when pulseaudio receive the hctl event, pulseaudio mute the four line
out playback switches

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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/874535

Title:
  Volume Slider Jumps, due to rapidly changing hardware jack sense state

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

Bug description:
  In Oneiric Release,  The volume slider randomly jump down a notch or
  two for fraction of  a second, even when there is no audio playing on
  the system.  If mute is selected, the menu will quickly flip out of
  mute mode and back again.  This change actually affects the audio
  output, resulting in pops correlated with the volume changes.

  nVidia GF106 Audio Controller
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC892 Analog [ALC892 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jfrorie    9959 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 54'
     Mixer name : 'Realtek ALC892'
     Components : 'HDA:10ec0892,1462522c,00100302'
     Controls      : 35
     Simple ctrls  : 20
  Card2.Amixer.info:
   Card hw:2 'Generic'/'HD-Audio Generic at 0xfbcf8000 irq 55'
     Mixer name : 'ATI R6xx HDMI'
     Components : 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 4
     Simple ctrls  : 1
  Card2.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  DistroRelease: Ubuntu 11.10
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  Package: pulseaudio 1:1.0-0ubuntu3.1
  PackageArchitecture: amd64
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
  Tags:  oneiric running-unity
  Uname: Linux 3.0.0-14-generic x86_64
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (82 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 11/16/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V25.0
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: X58A-GD45 (MS-7522)
  dmi.board.vendor: MSI
  dmi.board.version: 5.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.chassis.version: 5.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV25.0:bd11/16/2010:svnMSI:pnMS-7522:pvr5.0:rvnMSI:rnX58A-GD45(MS-7522):rvr5.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr5.0:
  dmi.product.name: MS-7522
  dmi.product.version: 5.0
  dmi.sys.vendor: MSI

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