[direx]

A space in the expression "Support for HDMI 2.0 a does not mean that HDR is supported." superfluous. I meant HDMI 2.0a!!!!

You said "HDMI 2.0 a [...] only means the ability to output video format 2160p@60Hz". And I said this is wrong, because the a in the HDMI spec actually stands for HDR metadata. And I also said that you are probably right about the fact that HDMI 2.0a does not necessarily mean the device will actually support HDR for sure - it's just an indicator that it might.
 

The implementation of HDMI 2.0a at the Apollo and Gemini are the same across the Converter from DisplayPort.
If you do not know, do not try to prove something 

Oh man, please do your homework (do you school's homework first of course). There are so many wrong things in just these two sentences. Where should I begin?
 

• Apollo Lake graphics architecture is based on Skyake. So if Skylake does not support HDR, Apollo Lake also cannot support HDR.
  
• Apollo Lake only has HDMI 1.4 and DP 1.2. You are right that many manufacturers solder an LSPCon chip on their mainboards which converts the DP 1.2 to HDMI 2.0. The MCDP2800BC is a famous LSPCon chip which even supports HDMI 2.0a with later firmwares. That still does not help us if the graphics engine cannot handle HDR information, so it still means no HDR on Apollo Lake (and Skylake). Apollo Lake NUCs for example are only advertised with HDMI 2.0 (no a). Gemini Lake NUCs are being advertised with HDMI 2.0a.
  
• Gemini Lake graphics architecture is based on Kabylake (Gen 9.5). It's actually newer, as Gemini Lake already has Gen10 display (see this). This means Gemini Lake has native HDMI 2.0a and does not need that crappy LSPCon chip any more.
  
• So we know for sure that Gemini Lake has Kaby Lake graphics (fewer execution units, but same media engine) and we also know that the actual Core i* Kaby Lakes do support HDR.
  
• And I never tried to prove that Gemini Lake will have HDR for sure. From my very first post in this thread I just said that it is way too early to give up on HDR support on GL, as there are strong indicators that it might be supported – despite the fact that one random guy claims he got his information straight from Intel.
  

But I am not going to argue any longer with you people about that. Sooner or later we'll know if HDR will be supported or not.