Most Windows laptops use a dedicated row of function keys at the top of the keyboard to control illumination. If pressing the designated key alters a different setting (like volume or screen brightness), hold down the while pressing it. Manufacturer Primary Keyboard Shortcut Alternative Combination HP F5 or Fn + F5 F9 or F11 Dell F10 or Fn + F10 F6 or Right Arrow Lenovo Fn + Spacebar Fn + Arrow Keys ASUS F7 or Fn + F7 Fn + Up Arrow (Gaming models) Acer F9 or Fn + F9 Fn + Right Arrow MSI Dedicated Backlit Button Fn + Page Up
Apple keyboards have a standardized layout that makes this very easy. how to turn brightness up on keyboard