[direx]

So you see that HDMI 2.0a is actually related to HDR. But since I don't have access to the HDMI spec I don't know if 2.0a only describes the capabilities of the interface or if it means that HDR must actually be supported.

For HDMI adopters to market their product with a certain HDMI version, the product must comply with the particular HDMI specification. HDMI interface has to comply with CTA 861.3-A or CTA 861-G to meet HDMI 2.0a certification.   

Still, the question which remains is: if a product is marketed with HDMI 2.0a does it mean that HDR has to be supported by the product? The Gemini Lake NUCs are marketed with HDMI 2.0a, so I was wondering if that has any implications in terms of HDR support.