there are difference between your macpro5,1 and other's macpro5,1

since the driver assume line in and mic jack are retaskable for
supporting 5.1 (especially all jacks are at same location)

Node 0x18 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Control: name="Center Playback Switch", index=0, device=0
    ControlAmp: chs=1, dir=Out, idx=0, ofs=0
  Control: name="LFE Playback Switch", index=0, device=0
    ControlAmp: chs=2, dir=Out, idx=0, ofs=0
  Control: name="Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Mic 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:  [0x80 0x80]
  Pincap 0x0000373c: IN OUT HP Detect
    Vref caps: HIZ 50 GRD 80 100
  Pin Default 0x01a19070: [Jack] Mic at Ext Rear
    Conn = 1/8, Color = Pink
    DefAssociation = 0x7, Sequence = 0x0
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=04, enabled=1
  Connection: 5
     0x0c* 0x0d 0x0e 0x0f 0x26

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https://bugs.launchpad.net/bugs/1026847

Title:
  [MacPro5,1, Realtek ALC889A, Green Headphone Out, Front] No sound at
  all

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

Bug description:
  Speaker works fine. The head phones do not work when I plug it in the
  front headphone jack. I have tried so so so many different things,
  none of them worked for me.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  NonfreeKernelModules: wl fglrx
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  abinash   32605 F.... pulseaudio
   /dev/snd/controlC0:  abinash   32605 F.... pulseaudio
   /dev/snd/controlC2:  abinash   32605 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xa0520000 irq 67'
     Mixer name : 'Realtek ALC889A'
     Components : 'HDA:10ec0885,106b4200,00100103'
     Controls      : 28
     Simple ctrls  : 10
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xa0440000 irq 68'
     Mixer name : 'ATI R6xx HDMI'
     Components : 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Card2.Amixer.info:
   Card hw:2 'U0x46d0x81b'/'USB Device 0x46d:0x81b at usb-0000:00:1d.7-3, high 
speed'
     Mixer name : 'USB Mixer'
     Components : 'USB046d:081b'
     Controls      : 2
     Simple ctrls  : 1
  Card2.Amixer.values:
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 6144
     Mono: Capture 6144 [100%] [30.00dB] [on]
  Date: Thu Jul 19 12:40:51 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_DevicesInUse:
   32605 32605 32605  abinash   F.... pulseaudio
   /dev/snd/controlC0:  abinash   F.... pulseaudio
   /dev/snd/controlC2:  abinash   F.... pulseaudio
  Symptom_Jack: Green Headphone Out, Rear
  Symptom_Type: No sound at all
  Title: [MacPro5,1, Realtek ALC889A, Green Headphone Out, Rear] No sound at all
  UpgradeStatus: Upgraded to precise on 2012-06-26 (22 days ago)
  dmi.bios.date: 10/07/10
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MP51.88Z.007F.B03.1010071432
  dmi.board.asset.tag: 0
  dmi.board.name: Mac-F221BEC8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.type: 7
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F221BEC8
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMP51.88Z.007F.B03.1010071432:bd10/07/10:svnAppleInc.:pnMacPro5,1:pvr0.0:rvnAppleInc.:rnMac-F221BEC8:rvr:cvnAppleInc.:ct7:cvrMac-F221BEC8:
  dmi.product.name: MacPro5,1
  dmi.product.version: 0.0
  dmi.sys.vendor: Apple Inc.
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2012-07-17T10:37:08.120965

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