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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Verified with 3.16rc5 on this system, this bug still exist
It behaves just like what I described in the bug description.

** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream-3.16-rc5

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

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https://bugs.launchpad.net/bugs/1339998

Title:
  [Dell Latitude 12 Rugged Extreme 7204] Microphone mute key does not
  work

Status in HWE Next Project:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201402-14663 Dell Latitude 12 Rugged Extreme

  The microphone mute key does not work on this system, so as its LED

  Steps:
  1. Install 14.04 + update (3.13.0-30), boot to desktop
  2. Try to mute the microphone with the hotkey (fn+F4)

  Expected results:
  * Mic mute key should work, its LED should be lit and the "Mute" option for input device should be ticked after you press the mic mute key.

  Actual result:
  * Nothing happened.

  Debugging information:
  ubuntu@201402-14663:~$ sudo showkey -k
  kb mode was ?UNKNOWN?
  [ if you are trying this under X, it might not work
  since the X server is also reading /dev/console ]

  press any key (program terminates 10s after last keypress)...
  keycode  28 release
  keycode 248 press
  keycode 248 release
  keycode 248 press
  keycode 248 release
  keycode 248 press
  keycode 248 release
  keycode  29 press
  ^Ccaught signal 2, cleaning up...

  xev cannot detect any microphone mute key event

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.55
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1501 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1501 F.... pulseaudio
  CRDA:
   country TW:
    (2402 - 2472 @ 40), (3, 27)
    (5270 - 5330 @ 40), (3, 17), DFS
    (5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Wed Jul  9 23:57:11 2014
  HibernationDevice: RESUME=UUID=b68f02ad-f5e4-4eb9-b88d-e85f60666734
  InstallationDate: Installed on 2014-07-10 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude 12 Rugged Extreme (7204)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic.efi.signed root=UUID=bdd00fe9-0df9-4b71-92c5-5f94c533f725 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.4
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/12/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0TH1GJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: X02
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd05/12/2014:svnDellInc.:pnLatitude12RuggedExtreme(7204):pvr01:rvnDellInc.:rn0TH1GJ:rvrX02:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude 12 Rugged Extreme (7204)
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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