I have this too.. it goes to black screen half-way during the boot and then after ~30 seconds, I can see the mouse pointer and then finally everything is fine. I rolled back to 10.12.1 for now. This is the second dual-monitor issue I have encountered with sierra :/
I haven't had any resolution issues yet, but I do have my screen resolution set in my clover config.plist. It did switch my main boot monitor from HDMI to DVI. The POST BIOS loading screen is also slightly longer than before.
I hope this helps somebody. If you have multiple monitors and are getting black screens on 10.12 even after applying the AGDPfix, but can login fine with only one monitor - trying turning on your CSM support in your BIOS. That fixed it for me. My setup is skylake, 980Ti, asrock z170 with...
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