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[Alexander Fedora <alexander.fedora@xxxxxxxxx>]

Thank you Raymond, I will look into patching it. I have no experience
working with kernel or audio driver.  Will need  to read the code and
documentation. It may take some time. But I could quickly confirm what
5ccc618fee67f0f0b2122dd4b32a02fd2b6a1569 is the commit, which causing
the problem.

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https://bugs.launchpad.net/bugs/1324384

Title:
  [Lenovo ThinkPad X61s] Speaker volume mutes itself in random intervals
  after upgrade to 14.04

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I've upgraded from ubuntu 13.10 and sound stopped working properly. It works in general. But mutes itself for small period  of time in random intervals. I've looked at alsamixer and it shown what once in a while some of the parameters got to the lowest level and then returning to normal after some time. It is reproing on Speaker. But also Internal Mic Boost jumps from 100% to 0% and then back to 100%. 
  BTW, when sound mutes on speaker, headphones are still working. So looks like alsamixer reports volumes  correctly. I've also tried to purge pulseaudio and alsa-base packages and re-installing them again.

  But I was able to find workaround. Audio works just fine with old
  kernels. I've tried with 3.5.0-15 and 3.5.0-27. It works with both
  kernels. I've also tried newest kernel from next ubuntu version.
  3.15.0-031500rc5 - audio is not working in new kernel.

  $ amixer -c 0 scontents > normal.txt
  SEE Attachment.
  $ amixer -c 0 scontents > muted.txt
  SEE Attachment.
  $ amixer -c 0 scontents > normalagain.txt
  SEE Attachment.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ghisguth   2519 F.... pulseaudio
                        ghisguth   3906 F.... pulseaudio
                        ghisguth  15548 F.... alsamixer
  Date: Wed May 28 22:50:29 2014
  HibernationDevice: RESUME=UUID=78076f7a-8340-428e-894b-ce095d0d278e
  InstallationDate: Installed on 2010-04-19 (1501 days ago)
  InstallationMedia: Kubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100406.1)
  MachineType: LENOVO 76693JG
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-27-generic root=/dev/mapper/ubuntu-root ro quiet splash crashkernel=384M-:128M
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-25 (33 days ago)
  dmi.bios.date: 10/22/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7NET29WW (1.10 )
  dmi.board.name: 76693JG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7NET29WW(1.10):bd10/22/2007:svnLENOVO:pn76693JG:pvrThinkPadX61s:rvnLENOVO:rn76693JG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 76693JG
  dmi.product.version: ThinkPad X61s
  dmi.sys.vendor: LENOVO

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