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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.

** Affects: hwe-next
     Importance: Medium
     Assignee: Hui Wang (hui.wang)
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Medium
     Assignee: Hui Wang (hui.wang)
         Status: Fix Committed


** Tags: 201402-14663 amd64 apport-bug blocks-hwcert kernel-bug-exists-upstream-3.16-rc5 latest-bios-a00 taipei-lab trusty
-- 
[Dell Latitude 12 Rugged Extreme 7204] Microphone mute key does not work
https://bugs.launchpad.net/bugs/1339998
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