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[Vladimir Katilevskiy <truaddict@xxxxxxxxx>]

Joseph, thanks for the answer.
Have just tried latest 3.12 kernel, but the bug is still there :(
I ll try to use hda-analyzer tool from alsa-project just to see what happening when I move the Bass speaker slider in alsamixer. It seems to me, that only right channel' slider of this mixer item works, while left always stays at 0, regarless of slider position.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1234252

Title:
  [MacBookPro8,1, CS4206] Left speaker low volume  and absence of low
  freqs

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 13.04 fresh install or fully updated - no difference.
  While listening music through internal speakers I noticed that left speaker sounds differently from the right one. I would describe left speaker's sound as those from the headphones lying on the table: low volume level and mostly high frequences are heard.
  1) Trying to check mixer levels in alsamixer, muting/unmuting, balance channels etc didnt help.
  2) In alsamixer there is a mixer item called "Bass Speaker". If I mute it, other playback items (including Master) are muted too. If I make its level to 0, then sound from both speakers become identical: low volume and without bass frequences. Level of the Bass Speaker resets if I adjust volume level from Unity volume control tool.
  3) Trying to set model parameter for intel_hda module to "mbp55" or "imac27" didnt help.
  4) Sound from headphones is perfectly ok.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  vkat       1970 F.... pulseaudio
   /dev/snd/pcmC0D0c:   vkat       1970 F...m pulseaudio
  Date: Wed Oct  2 19:12:40 2013
  InstallationDate: Installed on 2013-10-02 (0 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_Jack: Speaker, Internal
  Symptom_Type: High background noise, or volume is too low
  Title: [MacBookPro8,1, Cirrus Logic CS4206, Speaker, Internal] Background noise or low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-94245B3640C91C81
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245B3640C91C81
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,1:pvr1.0:rvnAppleInc.:rnMac-94245B3640C91C81:rvrMacBookPro8,1:cvnAppleInc.:ct10:cvrMac-94245B3640C91C81:
  dmi.product.name: MacBookPro8,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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