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AMD 7970 + Nvidia 670 black screen on login with AMD primary

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I have the above older cards, both work OOB and are supported. I prefer to have the AMD as the primary card and the Nvidia there in case I want to run an application with CUDA.

 

The problem is that the screen will be black on login when plugged in to the AMD card. At that point I can switch the output to the Nvidia and it will work fine. I haven't tested with the AMD in the secondary slot, but it doesn't matter, since I also want to be able to see the boot process taking place, which means having my monitor plugged into the primary card.

 

I'm really at a loss for troubleshooting this, I've tried adding various lilu-based "fixes" to the kext directories on the EFI/Clover part of the EFI partition. Installing Nvidia web drivers didn't help, either. Thanks in advance.

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