A "Display Adapter" or "PnP Monitor" update in Device Manager usually fixes it.
Look for a "sun" symbol. A hollow sun often represents decreasing brightness, while a filled sun or one with more rays represents increasing it. How to Use the Brightness Keys
💡 If your keyboard lacks brightness icons, you can usually remap keys using Microsoft PowerToys (Windows) or Karabiner-Elements (Mac). To help you troubleshoot further, let me know: What is your laptop model ? Are you using an external keyboard ? Did the keys stop working after an update? brightness key on keyboard
Click the icon in the top right menu bar for a manual slider.
I can provide the specific or software fix you need. A "Display Adapter" or "PnP Monitor" update in
Depending on your computer’s "Fn Lock" status, you may need to use a modifier key: 5+ Simple Ways on How To Turn Up Brightness From Keyboard
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If brightness keys work in BIOS but not in Windows, the problem is almost always a missing or corrupted hotkey driver. Download the full driver pack from your laptop maker’s support page, not just generic Windows updates.
Many brands require utility software: