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[After upgrading from Windows 7 or 8.1 to Windows 10, some users run into an error where they cannot adjust the screen brightness. Quite a few users find this error annoying because the screen is too bright or too dark and cannot be adjusted. The cause is an incompatible driver. To fix this error, check out my post below
I) Reinstall the Driver
The main cause is that older-generation machines do not yet have graphics drivers compatible with Windows 10, which leads to this problem. I tested on M4600 and M6600 machines, and both had the error of not being able to adjust the screen brightness on Windows 10. I fixed it as follows
Step 1: Uninstall all graphics drivers
Step 2: Go to the manufacturer’s website and download the Windows 7 graphics driver to install
Step 3: Restart the computer and check again
II) Run the .REG File
This is the simplest method: just download the .reg file below and open it, then restart and it is done
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