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[Raymond <1450947@xxxxxxxxxxxxxxxxxx>]

do you mean specify software_mute=N does not works as fallback?

you need to send email to the author of the patch,  acpi-devel and alsa-
devel mailing list

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https://bugs.launchpad.net/bugs/1450947

Title:
  [ThinkPad X60 - HDA Intel AD1981, playback] Volume Mute, Up, Down keys
  have no effect

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Since upgrade to 15.04 from 14.10, the physical volume keys (mute, up,
  down) on my ThinkPad X60 have no effect. I can adjust the volume via
  the menubar indicator, but the buttons are dead.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic i686
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   andrew     2071 F...m pulseaudio
   /dev/snd/controlC0:  andrew     2071 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Fri May  1 19:05:06 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-11-12 (535 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release i386 (20131016)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_CA:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_Type: Volume slider, or mixer problems
  Title: [HDA-Intel - HDA Intel, playback] volume slider problem
  UpgradeStatus: Upgraded to vivid on 2015-05-01 (0 days ago)
  dmi.bios.date: 11/20/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7BETD7WW (2.18 )
  dmi.board.name: 170686U
  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:bvr7BETD7WW(2.18):bd11/20/2008:svnLENOVO:pn170686U:pvrThinkPadX60:rvnLENOVO:rn170686U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 170686U
  dmi.product.version: ThinkPad X60
  dmi.sys.vendor: LENOVO

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