I have the same issue. I'm running Ubuntu 16.04 on an ASUS NX500 (graphics card is Nvidia 850M). I connect via display port to an external 4K ASUS monitor (built in display is also 4K) and I run 1.5 scaling on both. Nvidia display driver version is 361.42.
I have the same issue. I'm running Ubuntu 16.04 on an ASUS NX500 (graphics card is Nvidia 850M). I connect via display port to an external 4K ASUS monitor (built in display is also 4K) and I run 1.5 scaling on both. Nvidia display driver version is 361.42.