Hey guys! No need to force nvidia, Intel sandy bridge graphics also works. Even in optimus mode!
I was getting screen corruption with it until I applied the Duallink DSDT patch from this site:
BTW graphics acceleration still works in Optimus mode! (on Intel, I think). And in system report you can see two graphics cards (although both named untitled - Chameleon doesn't know how to inject when in optimus mode). It seems that with an easy DSDT fix we could get dual graphics working, and perhaps be able to switch with gfxcardstatus!