This message was posted on behalf of Intel Corporation
I understand you are trying to get 3840x2160@60Hz screen resolution through HDMI.
Let me apologize for any inconvenience this issue may be causing to you.
Depending on the type of HDMI port Samsung* installed in your computer then the maximum screen resolution you will be able to get. If Samsung* installed HDMI 1.4 port in the laptop then you will not be able to get 3840x2160@60Hz. The bandwidth 3840x2160@60Hz requires exceeds the maximum bandwidth HDMI 1.4 specification can support. If Samsung* installed HDMI 2.0 port on your laptop you should be able to get 3840x2160@60Hz.
The best option would be contacting Samsung* so they can let you know the type of HDMI port they installed in your computer.
Let me know if you have or not any other inquiry.
Wow, thanks Fred. I just assumed a new laptop would have HDMI 2.0 (and even some review websites say it does!) but that was the problem.
Intel CPU only offer UHD 60Hz on Displayport, the HDMI is 1.4 max (UHD 30Hz).
Notebooks with Displayport are very rare (HP business line).
There are converter chips (DP 1.2 to HDMI 2.0) but I haven't seen them in notebooks.
I really hope Intel will add native HDMI 2.x output to future CPU generations.