How to enable DCI P3 on LG UltraFine with Thunderbolt?

Question

Monitors

Hello everyone, I bought LG UltraFine 32UL950-W 31.5" to work with MBP 16.
When connected via the supplied Thunderbolt cable, the laptop is charging and the image is transmitted at 3840x2160 @ 60Hz, but some modes are not available in the monitor settings, which is why the picture is gray
When connected via a USB-C -> HDMI2.0 cable, additional modes are unlocked, the picture becomes juicy (in particular with DCI P3 98%), but the frequency drops to 30Hz
. Macbooks when working with HDMI, and you need to connect via USB-C -> Display port.
But I did not find anywhere how to achieve a normal picture with the supplied Thunderbolt cable.
Monitor firmware version, latest.

Answer 1

Haven't run into your problem, but if you're OK with having another cable (i.e. not annoying), then look into the DP side. I have an adapter for 1300 rubles from ozone that opens up much better on a 4k monitor.
As for USB-c USB-c - call LG and ask them what's up. I'm sure they already have cases about this.
There is software (at least 2 programs with a manual mode selection solution), I don’t remember now, but when I needed to enable HIDPI on the monitor, I used it. (one of them is SwitchResX). When the adapter for DP came, there were no problems.
PS - I wrote the answer, and only now I saw the date of your message. you at least send a solution here.

Answer 2

Found out at last.
It turns out that for some reason these modes are not compatible with HDR mode.
Disabling HDR in macOS settings helps.