Regarding HDMI version the spec which I gave a link to claims;
True Resolution : 3840x2160 at 60Hz (DisplayPort) ,3840x2160 at 30Hz (HDMI) 

Some while ago I was researching this issue and found a specification
page on the ASUS website which showed two formats for declaring the
frame rate, one extended only to the 1920 value while the other went to
the full 4K. From this I deduced that perhaps windows uses one report
format while linux uses the other. I cannot locate that page now, it may
have been taken down.

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https://bugs.launchpad.net/bugs/1890418

Title:
  i915 does not expose vendor-specific extended HDMI timings/modes

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