Press the keyboard backlight key, often marked with a light icon or a sun icon
Try Fn plus the backlight key
Increase keyboard brightness using the backlight key or Fn plus the key
Check your laptop settings or keyboard software for keyboard backlight controls
Enable keyboard lighting in the BIOS or UEFI if the option is available
Make sure keyboard backlight support is enabled on your device
Update your keyboard or laptop drivers if the lights do not turn on
Restart the device and try again