As of now, Windows 8 AMD drivers don't have brightness controls. This seems to be due to incorrect values in the registry. If you're running Windows 7, and have a 2G Tm2 (Core i3/i5) could you please check the correct values in the registry? More info here: The Ramblings of Adrynalyne: Fix Brightness Control for Windows 8 AMD SG Drivers Please post both the values for 0001 and 0000. Thank you in advance!