Do you use Linux?

[iSpeakVeryWell]

What you are missing is you literally can't do the speeds required in linux for hdmi 2.1 things at full chroma like you are trying to do. The reason its offering you subsampled chroma is a lack of bandwidth. An active adapter would fix this, I've been there myself with my 120HZ 4K OLED.

Your answer was still not making sense to me. I really felt like I was missing a crucial piece of information. I made some research and found out what I was missing and now your answer make sense.

I thought the feature open source drivers couldn't implement was DSC, but turns out it's also FRL (Fixed Rate Link) which is required to unlock the HDMI 2.1 bandwidth. Because open source drivers aren't authorized to implement FRL, the display and the GPU use older TMDS (Transition Minimized Differential Signaling) which make my HDMI 2.1 devices act like HDMI 2.0 devices.

This explain why my display is limited to 120Hz and also why it's using yCbCr 4:2:0 8b under Linux.

Regarding the use of a displayport adapter, sadly I've not found any that support 4K 144Hz 10b + VRR + HDR properly. Peoples report that they are not performing properly in these conditions.

So basically, I'm now on Windows because HDMI forum are a bunch of (insert here the appropriate word of your choice).

In conclusion, to me, it's hard to say that 2025 is the year of Linux when hooking high end TV's on a PC is a trend that gain in popularity. But if I exclude this HDMI 2.1 problem, I totally agree that Linux is in a very good position at the moment.

 

[R-T-B]

In conclusion, to me, it's hard to say that 2025 is the year of Linux when hooking high end TV's on a PC is a trend that gain in popularity. But if I exclude this HDMI 2.1 problem, I totally agree that Linux is in a very good position at the moment.

It's certainly a big fly in the ointment. HDMI forum should be ashamed, but hey, money.

Regarding the use of a displayport adapter, sadly I've not found any that support 4K 144Hz 10b + VRR + HDR properly. Peoples report that they are not performing properly in these conditions.

Oh, you have VRR too.

Yeah that's a windows situation sadly. You and I have traveled much the same road.

 

[AUTOEXEC.BAT]

As Main Distro I use Ubuntu. I am also trying others from time to time. Running a triple boot with Bazzite.

My main Rig is also Bazzite. Works perfect for me on Ryzen 9800X3D
My 2 HTPC's are running Debian 12 and ZorinOS 17.3 Pro

The time I spend is 95% Linux, gaming included.
For the games that dont work (yet) I use Windows.
But it will only get better, to the point Windows can be removed forever!

 

[Makalite]