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[Christian Dysthe <cdysthe@xxxxxxxxx>]

I have further updates on this:

I am running Ubuntu GNOME 14.04 daily and the mic mute/unmute is not
working on my Thinkpad T430S. I didn't think Ubuntu flavor was on
importance and that this was a kernel issue. Tthen I tried to boot
Ubuntu 14.04 daily and the mic mute/unmute works! The OSD information on
Ubuntu is wrong though showing volume mute/unmute but the microphone is
actually being muted/unmuted. Also, mic mute/unmute does not work with
final 3.14 mainline kernel on Ubuntu GNOME daily. This shows that
there's more than the kernel involved in this problem since it works in
Ubuntu 14.04 daily and not in Ubuntu GNOME 14.04 daily.

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https://bugs.launchpad.net/bugs/1268880

Title:
  unable to toggle microphone mute on T410 / unable to unload
  thinkpad_acpi module

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I recently pressed the physical microphone mute button on my Lenovo
  T410. However, I am now unable to unmute it. The orange light next to
  the mic mute button comes on when the kernel boots, but pressing it
  has no effect.

  Possibly related to this, I am now unable to unload the thinkpad_acpi
  kernel module (required to run the fan in disengaged mode to work
  around the long-standing bug 751689) as it seems to be permanently
  hooked into the sound drivers:

  $ sudo modprobe -r thinkpad_acpi
  modprobe: FATAL: Module thinkpad_acpi is in use.
  $ sudo lsmod|grep thinkpad_acpi
  thinkpad_acpi          69003  1 
  nvram                  14027  1 thinkpad_acpi
  snd                    60871  23 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,thinkpad_acpi,snd_seq_device,snd_seq_midi
  $ sudo modprobe -r thinkpad_acpi snd_hwdep snd_timer snd_hda_codec_hdmi snd_hda_codec_conexant snd_pcm snd_seq snd_rawmidi snd_hda_codec snd_hda_intel thinkpad_acpi snd_seq_device snd_seq_midi
  modprobe: FATAL: Module thinkpad_acpi is in use.
  $

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-2-generic 3.13.0-2.17
  ProcVersionSignature: Ubuntu 3.13.0-2.17-generic 3.13.0-rc7
  Uname: Linux 3.13.0-2-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.1-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  james      3261 F.... pulseaudio
   /dev/snd/controlC0:  james      3261 F.... pulseaudio
   /dev/snd/pcmC0D0p:   james      3261 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jan 14 08:52:57 2014
  HibernationDevice: RESUME=UUID=67e3cd44-242b-4bbf-918b-28fff81e0312
  InstallationDate: Installed on 2010-10-21 (1181 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: LENOVO 2516CTO
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-2-generic root=UUID=7ad192e9-7b26-49d1-8e1c-fefc7dc495cb ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-2-generic N/A
   linux-backports-modules-3.13.0-2-generic  N/A
   linux-firmware                            1.121
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-11-01 (73 days ago)
  dmi.bios.date: 08/27/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6IET72WW (1.32 )
  dmi.board.name: 2516CTO
  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:bvr6IET72WW(1.32):bd08/27/2010:svnLENOVO:pn2516CTO:pvrThinkPadT410:rvnLENOVO:rn2516CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2516CTO
  dmi.product.version: ThinkPad T410
  dmi.sys.vendor: LENOVO

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