I cannot change the screen resolution at all for the external monitor, which is 4K, in my surface 4 pro i7 with Intel graphics 640. The Intel graphics control panel does not display in this computer. The systems settings of windows either disable or do not allow setting the screen resolution of the external monitor up to 3840x2160. I tried REGEDIT changes with no success. The monitor is connected via an HDMI cable and an HDMI-MiniDisplayPort adaptor. The Microsoft help center specifies that my computer can support 4K in an external monitor.
What to do?