I also read that Windows 8 doesn't have this problem (only 8.1). I'm surprised that newer BootCamp drivers don't work. This hardware setup is different from all other windows laptops that use optimus or whatever and looks like it requires special treatment. The problem originates from the Apple's proprietary mux + Intel iGPU which is no longer hidden from Windows by BIOS emulator (you can actually see it in device manager). I think that external SSD doesn't matter. Windows 8.1 installed in native EFI mode on an external Thunderbolt SSD (which is easier for me than messing up with the internal drive since Bootcamp won't install in EFI natively on my model) Anyway, I'm happy with what I got.īlack screen when booting windows 8.1 in EFI after installing NVidia 650M drivers. I tried several other drivers (native drivers from BootCamp and even, the latest driver from nVidia website) but they all gave me black screen. After experimenting today I finally discovered that the driver from Bootcamp ( link - Boot Camp Support Software, it contains a relatively old but still good nVidia 306.37) is the only one that doesn't give black screen on boot.
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