do your computer chassis have the hda front audio panel with Jack
detection ?

ports:
                analog-output: Analog Output (priority 9900, latency offset 0 
usec, available: unknown)
                        properties:
                                
                analog-output-headphones: Headphones (priority 9000, latency 
offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-headphones"
        active port: <analog-?output>


Node 0x1b [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Front Headphone Phantom Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0001373e: IN OUT HP EAPD Detect Trigger
    Vref caps: HIZ 50 GRD 80 100
  EAPD 0x2: EAPD
  Pin Default 0x02214120: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0xc0: OUT HP VREF_HIZ
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 5
     0x0c 0x0d 0x0e 0x0f 0x26*

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1207364

Title:
  no sound since upgrade to 13.04 [System Product Name, Realtek ALC892,
  Green Line Out, Rear] No sound at all

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  alan@Alpha-ubuntu:~$ aplay -l
  **** List of PLAYBACK Hardware Devices ****
  card 0: SB [HDA ATI SB], device 0: ALC892 Analog [ALC892 Analog]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 0: SB [HDA ATI SB], device 1: ALC892 Digital [ALC892 Digital]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  alan@Alpha-ubuntu:~$ alsamixer
  alan@Alpha-ubuntu:~$ ubuntu-bug -s audio
  1909

  (process:10727): GLib-CRITICAL **: g_slice_set_config: assertion 
`sys_page_size == 0' failed
  alan@Alpha-ubuntu:~$ lsb_release -rd
  Description:  Ubuntu 13.04
  Release:      13.04
  
------------------------------------------------------------------------------------------------------------------------------

   apt-cache policy pulseaudio
  pulseaudio:
    Installed: 1:3.0-0ubuntu6
    Candidate: 1:3.0-0ubuntu6
    Version table:
   *** 1:3.0-0ubuntu6 0
          500 http://us.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status
       1:3.0-0ubuntu1~ppa1 0
          500 http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/ raring/main 
amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: pulseaudio 1:3.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
  Uname: Linux 3.8.0-27-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alan       1909 F.... pulseaudio
  Date: Thu Aug  1 09:22:06 2013
  InstallationDate: Installed on 2012-06-09 (418 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MarkForUpload: True
  SourcePackage: pulseaudio
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:SB successful
  Symptom_Card: Built-in Audio - HDA ATI SB
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alan       1909 F.... pulseaudio
  Symptom_Jack: Green Line Out, Rear
  Symptom_PulsePlaybackTest: PulseAudio playback test failed
  Symptom_Type: No sound at all
  Title: [System Product Name, Realtek ALC892, Green Line Out, Rear] No sound 
at all
  UpgradeStatus: Upgraded to raring on 2013-07-15 (17 days ago)
  dmi.bios.date: 06/11/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1401
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A88TD-V EVO/USB3
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1401:bd06/11/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A88TD-VEVO/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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