Restart Display AdapterĪt times, the display adapter on your computer can glitch out and stop the brightness slider from functioning properly. If any updates are available, install them and restart the computer. Type windows update into the Start menu and then press Enter to check for new Windows updates. If the brightness slider isn’t working due to known issues with the operating system, especially after a major feature update, then Microsoft is bound to address those immediately. The first course of action that you need to take before doing anything else is to check for new Windows 10 updates.
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