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First of all, you need to check if your laptop comes with an ambient light sensor that detects the level of your ambient light and adjust the level of your screen brightness accordingly all by itself. If true, turn off the ambient light sensor to solve your problem.
If you are sure that the Adjust Laptop Brightness software only changes your screen contrast other than brightness, read the following content.
When Brightness Levels of your Laptop Screen cannot be identified by the Adjust Laptop Brightness software, the contrast will be adjusted in stead of the brightness. The solution is to go to the vendor of your display adapter, download and install the proper device driver for your display adapter. After installing the device driver, Brightness Levels can be identified by the Adjust Laptop Brightness software. You will be able to adjust brightness levels rather than contrast levels.
The following shows the mainstream vendors,
Click Support->Download Drivers->Select your Product Type, Series, Operating System, Language->Search->Download
Click Support & Drivers->Select your Component Category, Product Line, Product Model, Operating System->View Results->Download
Click Support->Select Product Family, Product Line, Product Model->Search
NOTE: AMD offers a Driver AutoDetect Tool to help you identify the model of your display adapter and find the proper drivers for you.