recently i got a new notebook, the hp dv6-6159sl.
this notebook has 2 gpus, the intel 3000 igp and a dedicaded 6770m. unfortunately only the HP-ati drivers work, not the official ati ones. with a preinstalled software i can choose if a programme/game should run in performance mode (6770m) or low power mode (intel igp). sure, i set it on performance mode.
in game i let the default graphic settings.
with the direct x9 renderer i have about 50fps, when i change to open gl (normally more powerful) i just have 2 fps so i lag.