Hello,
Thank you for posting in Q&A forum.
Try selecting Search on the taskbar, typing "Device Manager," and then selecting "Device Manager" from the list of results. In Device Manager, select Display Adapters, and then select the display adapter. Press and hold (or right-click) the display adapter name, then select "Update Driver" and follow the instructions.
Please refer to the link: Change screen brightness in Windows - Microsoft Support
I hope the information above is helpful.
Best Regards,
Yanhong Liu
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