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Author Topic: Why is Apple's EFI graphics incompatible with Windows in UEFI?  (Read 12971 times)

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« on: December 24, 2014, 07:39:03 PM »

After fighting with Windows trying to get UEFI on my MacPro5,1, I am giving up and going back to BIOS. It installed fine, but as soon as the graphics driver is loaded I get no image? I have graphics until the login window, then I get a black screen (this is with both my Apple 8800GT and my Apple GT 120). If I try a non-flashed card (EVGA GT 520) I have no graphics until I get to the login screen. I noticed the official Sapphire 7950 for Mac has a switch on it that switches between CSM/Apple EFI and a UEFI compliant firmware. This must have something to do with it. Curios if anybody knows why this is.
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« Reply #1 on: December 26, 2014, 04:28:35 PM »

are you sure it's just graphics getting missed and not complete system lockdown ?
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