Due to my ignorance and a lot of trial and error there is finally an active 4K adapter available (3840x2160 in my case, spec adapter above) at 60 Hz with HDR support. Tried other adapters that provide either 3840x2160@30Hz or 3840x2160@60Hz but cannot handle HDR signal. Finally, I came across an Intel white paper that mentions Club3D. I bought this adapter from this Dutch brand and it works like magic. Setup: Intel HD Graphics 620 on Viewsonic PX-727-4K Thanks Club3D.
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