I would suggest going to AMD.com and downloading the latest version of the driver and reinstalling it. That should fix it as I have no issues with it in 8.1 but I did a clean install of 8.1.http://support.amd.com/en-us/download/mobile?os=Windows
8.1 - 64
Download the AMD Mobility tool and run it to make sure you can use AMDs drivers. If not you will have to go through Samsung in order to get the proper driver.