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[Nizar Kerkeni <nizarus@xxxxxxxxxx>]

I confirm this bug for xubuntu 16.04 LTS
A workaround to get F5/F6 working is described here : 
 http://sajan.io/blog/asus-x200m-perfect-linux-ubuntu-xubunu-utility-laptop
The notification is about change is displayed but the back-light is not changing.

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

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https://bugs.launchpad.net/bugs/1329510

Title:
  [Asus X200M] Changing Backlight not working

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Backlight setting is not working with Lubuntu 14.04.

  This bug is reported following
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight#Debugging_information_to_provide_in_your_bug_report
  guidelines.

  WORKAROUND: Backlight can be set with xbacklight after creating
  /usr/share/X11/xorg.conf.d/20-intel.conf :

  Section "Device"
      Identifier "card0"
      Driver "intel"
      Option "Backlight" "intel_backlight"
      BusID "PCI:0:2:0"
  EndSection

  but special keys are not working, and there are no events in
  acpi_listen when pressing these keys.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-29-generic 3.13.0-29.53
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  guillaume   1447 F.... lxpanel
  CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type: 'iw'
  CurrentDesktop: LXDE
  Date: Thu Jun 12 21:52:16 2014
  HibernationDevice: RESUME=UUID=5b0a59aa-0acf-415f-93bd-62df1b558efb
  InstallationDate: Installed on 2014-06-12 (0 days ago)
  InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
   Bus 001 Device 002: ID 0bda:5603 Realtek Semiconductor Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X200MA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic.efi.signed root=UUID=37551324-2550-4e13-aea9-4603fbd63807 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-generic N/A
   linux-backports-modules-3.13.0-29-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X200MA.302
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X200MA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX200MA.302:bd01/21/2014:svnASUSTeKCOMPUTERINC.:pnX200MA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX200MA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X200MA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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