I have Samsung NP530U4B laptop with two graphic cards - Intel HD3000 series and AMD Radeon 7550M.
To switch between this card i tried to install driver from samsung site (through SW Update tool) and leshcat's driver UnifL, both on clean Windows 8. Both has the same problem - when i right-click on desktop and click "switchable graphic options" (the title maybe be a little different - i have russian version of catalyst), some catalyst process starts and then ends in 15 seconds. When i click "Application settings of switchable graphics" in CCC, it just shuts down.
Through the gpu-z i can see that while using some complex graphic apps (eg: games), only intel card is being used.
I tried: Catalyst 12.11 beta 11, Catalyst 12.10, UnifL 12.11 beta 11, UnifL 12.11 beta 6, "AMD PowerXpress 9.002.0.0000 WHQL" from samsung.