Solution
When the AI Light Sensor is ON,
ASUS Illuminate Keyboard will auto Switch LED On/Off according to ambient lighting.
In Dark place, the KB LED will be On let user see letters clearly
In Bright place, the KB LED will be Off to save power and will lock LED to avoid accident turn on to waste power
When the AI Light Sensor is OFF,
You can press FN+F3 ,the KB LED will be dim light until Off ;FN+F4,the KB LED will be ON