Comment 7 for bug 1674304

I can't see anything obviously wrong with your kernel output. It seems as if the nvidia_modeset driver has loaded. I assume xrandr --verbose output also reports PRIME sync: 0?

However, the NVidia forum has some reports by people with similar problems, hinting at a potential incompatibility of the 375.39 NVidia driver with at Linux 4.10 from the Ubuntu 17.04 beta. Maybe try with a 4.8 kernel?

See

https://devtalk.nvidia.com/default/topic/957814/linux/prime-and-prime-synchronization/10