I recently bought an ASUS N56VM which is suppose to ship with a backlit keyboard. However on startup and when dark there is no backlit keyboard. When pressing the Fn+F3/F4 buttons, the animation for increasing/decreasing the brightness of the keyboard does appear. How do I fix this problem. Its an ASUS N56VM-S4034V.
I have recently corresponded with Asus Support on this subject and they have confirmed that
Trust that assists
If your keyboard lights flash on when you turn it on, then there is a problem with the firmware. If you use Winflash to update to 214, you will lose the lights. To do it without losing the lights, make sure the keyboard lights are set to off and then update from inside the BIOS using EasyFlash.
In Ubuntu, all keys are programmed and controlled by X windows, keyboard drivers, Window Managers etc. So all functions keys which behaved in certain ways (eg, to dimmer the backlit) as documented for Windows OS, have to be reprogrammed for Ubuntu.
Reading this for details:
Executing this as root:
echo 3 > /sys/class/leds/asus::kbd_backlight/brightness
I managed to get the keys all lighted up. And here is to off the light completely:
echo 0 > /sys/class/leds/asus::kbd_backlight/brightness
Values in between will have different brightness.