Press the F5, F9, or F11 key to turn your HP laptop keyboard light on or off. Some HP laptops need the Fn key pressed with ...

If your model has a Touch Bar on the keyboard, expand the Control Strip, then tap the increase brightness button or the decrease brightness button. To turn to backlight off, touch and hold.

It's possible that the reason your Mac keyboard backlight won't work is that you've accidentally dimmed it to the lowest Ievel. The steps for confirming and undoing this might differ depending on ...