How I do to get RGB on Silverblue using an Intel iGPU (Alder Lake) through HDMI?

Hi, I’m a little sick about the poor VA-API support for AMD, so I decided to enable the Intel iGPU of my 12600K and use it as my primary GPU. I’m a gamer, so I need the RX 580 for games.

The Intel iGPU works well, but the color looks horrible at least through HDMI (I don’t have a DisplayPort cable and my display doesn’t have any DisplayPort connector) on the Wayland session, it doesn’t seem to be in RGB. I tried two thing to correct that, but I don’t find the ''gdm.service" file in Fedora Silverblue 37 and a second workaround I found in Reddit didn’t work either.

I know that you have to use ‘rpm-ostree’ to set kernel params in Silverblue, Kinoite and IoT, but I don’t know if I have to proceed the same way to have the correct color gamut in Silverblue.

Sorry if my English is not fully correct.