If you are using a Windows-based laptop and are experiencing errors, unable to adjust the screen brightness, do not worry too much or rush to the repair shop but try them all. the following ways. Here I will guide you how to fix this problem.
1. Update the operating system version again
The latest updated version will help you fix the bugs of the old version so give it a try. By clicking on Check for updates section to check if your laptop is supported for updates.
2. Update the monitor driver
Step 1: Right-click on the windows frame and then select Device Manager.
Step 2: Right-click on Display adapters => Select Update driver.
Step 3: Then click on the dialog box Search automatically for updated driver software to search for the update.
Step 4: If an update is found and accepted, it may take a few minutes.
3. Reset the monitor driver
As in updating the driver, right-click the Display adapter and select Disable device. Then the screen will turn off and restart you just need to re-enter Device Manager and enable the device again.
4. Reinstall monitor driver
Step 1: Click the Uninstall device option .
Step 2: Click the option Scan for hardware change to reinstall the driver.
5. Fix the error with the Troubleshooter feature
Step 1: Go to settings and select Update & Security.
Step 2: Go to Trooubleshoot => select Power => Run the troubleshooter
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