I'm having an exact symptoms as this person:
I'm using Sony VGN-NR160E and here is my spec.
VGN-NR160E/T | VAIOŽ NR Series Notebook | Sony | SonyStyle USA
I think I installed the right graphic driver, which is Intel:X3100 and EFI string for Intel.
What can I do at this situation? It would be really great if someone can help me out!