Step 2: Navigate to Hardware and Sound > Power Options. See what you should do: Step 1: Open Control Panel in Windows 10 and view all the items by Category. It is also useful if you encounter the problem in Windows 7 and 8.
To fix the issue of laptop brightness not changing, you can tweak some power options settings. Here manage to change from Multimedia key to Function key. Thus you may need to change the Fn key behavior to fix this volume keys issue.
It is possible that the issue that your volume keys stop working on Windows 10 is due to incorrect Fn key behavior. Why is the volume button on my computer not working? Press and release the right arrow key repeatedly, while holding down 'Fn,' to decrease the screen brightness slowly, or hold the keys to darken the screen as low as the setting will go. The 'Fn' and right arrow key will increase brightness. Press the 'Fn' and left arrow keys together on some HP laptops to turn down the brightness. Frequently Asked Questions How do you adjust the brightness on a HP laptop?