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[Launchpad Bug Tracker <1491119@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/1491119

Title:
  backlight functions keys not working

Status in linux package in Ubuntu:
  Expired

Bug description:
  I have ubuntu 14.04 running on Dell E5430. Backlight control is working fine, but cannot be controlled via function keys (Fn+Up/Down). When xev started all other function keys works correctly, when Fn+UP/Down is pressed sometimes event is registered after +/- 10 seconds, sometimes is lost completely.
  And the issue is gone after I suspend/resume the system :|
  After reboot the issue is back again.

  ---
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pch3       1896 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=966efffc-8e7b-49c5-9303-84bffedcdacf
  InstallationDate: Installed on 2015-02-22 (309 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Dell Inc. Latitude E5430 vPro
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-55-generic root=UUID=22a1946f-69a8-4c5d-8d53-e027bf47e12e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-55.74~14.04.1-generic 3.16.7-ckt19
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-55-generic N/A
   linux-backports-modules-3.16.0-55-generic  N/A
   linux-firmware                             1.127.19
  Tags:  trusty
  Uname: Linux 3.16.0-55-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 12/10/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0NVFXC
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd12/10/2012:svnDellInc.:pnLatitudeE5430vPro:pvr01:rvnDellInc.:rn0NVFXC:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5430 vPro
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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