Originally Posted by papamiraculi
This post seems to be all wrong. [email protected]
HDR has been proven to work on the CX just like on the C9 (take the rtings test as an example).
And as stated above, HDMI 2.0 limitations only allow for [email protected] HDR 4:2:2 10bit. You can not use 12bit with this resolution, neither on the CX nor on the C9.
Please refer to the FAQ that dfa973 has painstakingly put together.
The LG C9 Secret menu HDMI diagnostic report is reporting inaccurately due to the technical limitation of HDMI.
When setting your PC to 4K 60Hz at 4:2:2 at 12-bit and enabling HDR on Windows, you are sending a 12-bit signal. Else, even Nvidia control panel will show you that it did not accept the 12-bit signal and has instead fall back to 8-bit. So the C9 pretty much does HDR at 12-bit 4:2:2 at 60Hz.
Problem: The TV is reporting that image has 8bit instead of 10/12bit;
Cause: When the TV is getting a 4:2:2 HDR signal it is always reported as 8-bit even though it is receiving 12-bit. This is a technical limitation of HDMI. The only way to verify what bit-depth you are getting is to use test patterns. It's the same reason why Dolby Vision is reported as SDR. Because the TV doesn't actually "know" what it is getting.
To make it very simple, the CX thing will not be an issue if more TVs decide to adopt this crippled form of HDMI 2.1 like we know what LG has done with its 2020 TVs and what Samsung has done to its own 2020 TVs with very few HDMI 2.1 ports that they have. They are all limited to 40Gbps.
If more people complain because of their crippled ports, this will help push Nvidia to bring 10-bit 4:4:4 support to the next gen HDMI 2.1 consumer RTX cards. Along with forcing both Sony and Microsoft console manufacturers to get the 10-bit 4:4:4 support on their consoles as well.
With it, then the CX gaming owners problem will go away.
Similarly, another option that CX gaming/PC owners have is to HOPE that the HDMI DSC compression technology brings with it very little latency penalty due to the encoding and decoding that the HDMI chips have to do on each end. With this, you could also potentially get 4:4:4 12-bit support via this visually
lossless method. Again, this depends on how much latency it adds as a result. This could be a solution if Nvidia or even the next gen consoles too decides to still not bring 10-bit support.
So that pretty much sums up the CX gaming owner issue.