How to Change Screen Brightness in Windows 10
1. Try updating your display adapter driver in Device Manager.
a) Press Win + R together to open the “Run” dialog, enter devmgmt.msc.
b) Expand the Display adapters and right click on your graphics card, select Update Driver Software…
c) Select the first option to search automatically for update.
2. If updating driver doesn’t work , then try Roll Back a Device Driver to a Previous Version.
a) Right click on your graphics card (Nvidia/AMD/Intel) , select Properties this time.
b) Go to the Driver tab, click on Roll Back Driver…, then proceed with warning and finish the process.
3. If neither of them helps, then make sure you enable your PNP monitor.
Find the Generic PNP Monitor in Device Manager, right click on it and check if it’s disabled.
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By now you probably have it solved already, adjust your brightness again and share this with your friends if you think it is helpful. Thanks!