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[SonWon <sonwon.1@xxxxxxxxx>]

I've been doing some investigation and have discovered the following.
If I perform these commands the back-light changes:

echo 0 | sudo tee /sys/class/leds/asus::kbd_backlight/brightness
echo 1 | sudo tee /sys/class/leds/asus::kbd_backlight/brightness
echo 2 | sudo tee /sys/class/leds/asus::kbd_backlight/brightness
echo 3 | sudo tee /sys/class/leds/asus::kbd_backlight/brightness

Also there is a script called /etc/acpi/asus-keyboard-backlight.sh

I thought maybe this script wasn't being called and remapped the keys to
the script and it still would not work.  So I manually entered each
script line and tested which worked fine accept I couldn't test this
line:

if [ "$1" = down ]; then

I assume the $1 variable is only passed when called by the keyboard
handler or is it possible this is the problem?  How do I discover if
this is being passed?  How do I figured out if the script is even being
called by the keyboard handler?

I have enough information now to make a workaround but would like to see
this fixed in future versions.

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https://bugs.launchpad.net/bugs/1327828

Title:
  [Asus G53JW] Cannot change keyboard backlight brightness

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  When pressing function key plus F3 or F4 the backlight on the keyboard
  does not change.  This was working on a Ubuntu 13.10.  No longer works
  in ubuntu 14.04.

  ---
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  sonwon     2028 F.... pulseaudio
   /dev/snd/controlC1:  sonwon     2028 F.... pulseaudio
   /dev/snd/controlC0:  sonwon     2028 F.... pulseaudio
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=4d6d29f4-40a8-44cf-80ea-f0fd044e7f80
  InstallationDate: Installed on 2014-06-08 (1 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: ASUSTeK Computer Inc. G53JW
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=7eb10043-4463-42ac-bef7-723d8c108f94 ro quiet splash
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-generic N/A
   linux-backports-modules-3.13.0-29-generic  N/A
   linux-firmware                             1.127.2
  Tags:  trusty
  Uname: Linux 3.13.0-29-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/28/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: G53JW.211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: G53JW
  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.:bvrG53JW.211:bd01/28/2011:svnASUSTeKComputerInc.:pnG53JW:pvr1.0:rvnASUSTeKComputerInc.:rnG53JW:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: G53JW
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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