- indep_hp (bool): provide the independent headphone PCM stream and
  the corresponding mixer control, if available

does mac pro 5,1 support multistreaming ?

http://www.intel.com/support/motherboards/desktop/sb/CS-034206.htm

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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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