Working in a dim room, you press the usual key to light up the keyboard, and nothing happens. When a Windows 10 keyboard backlight not working problem appears, typing YYPAUS Login in the dark gets much harder.
Windows 10 does not control the keyboard light by itself. The backlight is run by the laptop’s firmware and by the manufacturer’s own hotkey software, which is why the fix differs a little from brand to brand.
Most of the time the light has not failed. It has been switched off, set to turn off after a few seconds, or is waiting for a hotkey driver that an update removed.
What Might Be Causing It
The keyboard light usually stays off for one of these reasons:
- The backlight was turned down to its lowest level with its function key.
- A timeout setting switches the light off after a few seconds without typing.
- The manufacturer’s hotkey or keyboard utility is missing or out of date.
- The setting is turned off in the BIOS, or the laptop model has no backlight at all.
First Steps to Try
Start with the keyboard itself.
- Find the key with a small keyboard or sun symbol, often F5, F9, F10, or the Space bar, and press it together with Fn several times. Many laptops cycle through off, low, and high.
- If the light comes on and then goes off, press any key and see whether it turns on again. If it does, a timeout is the cause.
- Plug in the charger and turn off battery saver from the battery icon in the taskbar.
- Press Windows + X, open Mobility Center, and look for a keyboard brightness or backlight tile, which some Dell and HP models show.
If the Problem Continues
Next, check the manufacturer software and firmware.
- Open the laptop maker’s utility, such as Lenovo Vantage, MyASUS, Dell’s keyboard settings, or HP’s system app, and look for the backlight and timeout options.
- If the hotkeys stopped working after an update, download the hotkey or keyboard driver for your exact model from the manufacturer’s support page.
- Restart the laptop and press F2, F10, or Delete to open the BIOS. Look for “Keyboard Illumination” or “Backlit Keyboard Timeout,” turn it on, and set a longer timeout.
- Install any BIOS update that mentions keyboard or hotkey fixes, with the charger connected.
Protect Your Data First
Change only the keyboard settings in the BIOS, and write down anything you change. Never interrupt a BIOS update, because a failed update can stop the laptop from starting. Download drivers only from your laptop maker, not from driver-finder websites.
The Bottom Line
A keyboard light that will not come on is usually switched off, set to time out, or missing its hotkey software. Try the Fn key first, then the manufacturer’s app and BIOS settings. If the light stays dark everywhere, a technician can check the hardware.
