Updated to 10.12.1 through the AppStore and after restarting the update, i lost signal to my monitor (hdmi) and can only boot using safe mode and cpu graphics. I went to check the plist from AppleGraphicsControl kexts and my Board ID wasn't there again (the update erased it), so i add it again and set it to None but still no luck, keep losing signal to the monitor with my GTX 660 Ti.
Im currently using iMac 12,2 system definition and it was working flawless with 10.12 (had to add Board ID to AppleGraphicsControl.kext/Contents/PlugIns/AppleGraphicsDevicePolicy.kext/Contents/Info.plist).