This is fixed on 12.04.4 and 13.10. on my MacBookAir6,2.

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https://bugs.launchpad.net/bugs/1212639

Title:
  MacBookAir6,2,  No sound though speakers

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

Bug description:
  Hi there,

  There is no sound from the Mac's internal speakers. Audio interface is
  detected in pulseaudio and sound works through the headphones jack.
  Adjusting the volume displays the volume control bar correctly, but it
  has no effect.

  MacBook Air 6,2
  Intel® Core i7-4650U CPU @ 1.70GHz 
  8GB RAM
  128GB SSD
  Ubuntu 13.04

  lspci | grep Audio
  00:03.0 Audio device: Intel Corporation Device 0a0c (rev 09)
  00:1b.0 Audio device: Intel Corporation Lynx Point-LP HD Audio Controller 
(rev 04)

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  Uname: Linux 3.11.0-rc4-custom x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  orm        1821 F.... pulseaudio
  Date: Thu Aug 15 11:36:21 2013
  InstallationDate: Installed on 2013-08-09 (6 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  orm        1821 F.... pulseaudio
  Symptom_Jack: Speaker, Internal
  Symptom_Type: No sound at all
  Title: [MacBookAir6,2, Cirrus Logic ID 4208, Speaker, Internal] No sound at 
all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/24/2013
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA61.88Z.0099.B00.1305241529
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-7DF21CB3ED6977E5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir6,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-7DF21CB3ED6977E5
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B00.1305241529:bd05/24/2013:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:ct10:cvrMac-7DF21CB3ED6977E5:
  dmi.product.name: MacBookAir6,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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