Samsung Series 7 laptops use Fn+F2 and Fn+F3 to increase and decrease display brightness. When I press the those keys, an indicator appears on screen but no change is made to the brightness. Why?
The fn keys are handled by the Samsung dmhkcore.exe process ( C:\Program Files (x86)\Samsung\Easy Settings\dmhkcore.exe ). If you are logged in as a limited user, the Fn combinations with F1, F2, F3 and F12 will not work.
Terminate the process and rerun it as administrator.
Edit: I have found that opening the exe in a hex editor and searching for