I own a Toshiba Satellite (Model P755-12F) and I've been trying to get Mac OS X working for quite a while with no success.
The problem is the video arhitecture ( Intel HD3000 (on CPU) and nvidia optimus 540m).
On further research I found out that there is no way to run both at the same time or just the nvidia one on OSX.
So, the first thing that I tried was to request a bios unlock on a few forums so I could get access to the advanced options and disable the optimus. I ended up with no results.
Then, I tried to use different Intel kexts, but that wouldn't have helped much, cause the bootloader would detect the nvidia card at boot and create further conflicts in the OS.
Removing the nvidia (and ati) kexts didn't help much, the OS freezes when it's requested to do an action (randomly) and windows get stuck in plain animations with transparency (still funtional, but screwed up).
So I noticed that the nvidia optimus has to be disabled before booting, and there were only 2 ways: DSDT or BIOS.
Since the BIOS method failed already and I have no knowledge of DSDT editing, could someone edit my DSDT and remove the nvidia card from it?