[_Spook_]

So, I did som playing around with the NUC6i5SYK and using a Club3D CAC-1170 (firmware 0x26) miniDP->HDMI 2.0 converter. This works fine with image sync. This converter uses the Paradtech PS176 chip, while Intel uses the Paradetech PS175 chip in the NUC6i7KYK.

My guess is that the problems I am having is firmware related. And hopefully Intel will release a new firmware soon. The current one is 0x20, so it's quite old.