Brightness wont change

Question

the brightness on my computer will not change using the bar in setting for in notification center. i have tried using device manager and i can not find graphic properties to use that method

Answer 1

Hi,
I have did some quick tests based on following KB and would like to share the results:
Change screen brightness in Windows 10
https://support.microsoft.com/en-us/windows/change-screen-brightness-in-windows-10-3f67a2f2-5c65-ceca-778b-5858fc007041

Test environment:
Machine A, computer with 1 external monitor, Win10 20H2:
Unable to find brightness modify in Notification center as well as in the Settings since it is controlled by buttons on the monitor.

Machine B, laptop with 1 external monitor, Win10 20H2:
There is slider to adjust brightness for monitor of laptop in notification center and Settings. But for the external monitor, we failed to call out the notification center but only use duplicate mode.

To update display driver, in the search box on the taskbar, type Device Manager, and then select Device Manager from the list of results. In Device Manager, select Display adapters, then select the display adapter. Press and hold (or right-click) the display adapter name, then select Update driver and follow the instructions.

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Hope this helps and please help to accept as Answer if the response is useful.

Thanks,
Jenny