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

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