So, I bought an RX 7600 XT, when I was still using my 10 year old TV. Recently upgraded to an LG C4, reading the news about AMD support for HDMI 2.1 on Linux, I also went looking for a DP->HDMI adapter and found one that claims to even support VRR. After a week of getting random audio cuts, suspecting the adapter was at fault, I went pure HDMI…
To my surprise, I could run at 4K 120hz with VRR and HDR. Doesn’t that require HDMI 2.1?
The real question is though… if you haven’t noticed the TV using YCbCr420 until it was pointed out to you, why would you spend more time looking into it?
In retrospect, I have noticed. Thought it was badly compressed content.