o You'll always use the integrated one to handle displays. PrimaryDisplay = Display_iGFX
o You'll most likely have to figure out how to toggle power to the dGPU.
The dGPU appears with PrimaryDisplay=Display_Switchable. Optimus isn't implemented yet, so power consumption is likely increased and nouveau can't find the vbios. In addition, I see the following error in dmesg:
"NVRM: GPU 0000:01:00.0: Failed to enable MSI; falling back to PCIe virtual-wire interrupts."
I thought I had tried this option before, but perhaps there was a different option at the time that was preventing the display from working (perhaps an improperly configured VBT). In any case, there's a little bit of clean-up for me to do and then this hopefully can be committed.
Thank you everyone for helping me along the way.