Cannot get 4K 120hz, HDR and VRR at the same time

Bazzite
1

Hey folks,

Running bazzite on my ROG ally x docked through an hdmi 2.1 capable dock, with an hdmi 2.1 cable, to an LG C5 and no matter what I do I cannot get it all to work at the same time.

If I turn on VRR, and 4k 120hz, then turn on HDR last, the tv does not turn on hdr (can check in the settings if it is currently active) and all the colors look very muted .

If i turn on HDR first and set the resolution, when i turn VRR on in game mode settings, it also doesnt turn on.

No matter what I do I cannot get it to work, even on 4:2:2, even on 4k 100hz instead of 120 or 144.

It does work on 4k 60hz.

Does anyone have any ideas on how to get this to work, hdmi 2.1 limitation on linux? Can I use a different dock of some sort.

2

My guess is you are experiencing bandwidth limitation. I don’t know how you are getting 4k 120Hz but it is likely not 4:4:4 through your HDMI connection currently as AMD does not support that natively and most docks do not actively convert the signal from DP to HDMI 2.1

By best guess would be to use the DisplayPort and try the UGREEN 8K adapter: Amazon.com: UGREEN 8K@60Hz Active Display Port to HDMI Unidirectional Adapter with 4K@240Hz 2K@240Hz, DP 1.4 PC to HDMI 2.1 Display G-SYNC Male to Female Cable, Aluminum Converter Compatible with AMD NVIDIA : Electronics