I bought a LG 4k Oled B5 TV that has freesync support, VRR 120hz, but no display port.
My bazzite KDE PC is a Ryzen 7600 with a RX7600 OC, so it can’t play 4k.
I never had a 4k tv before. Should I just configure Plasma and Steam to use 1080p as native resolution and freesync and that’s it? I hear about upscaling using gamescope, about no VRR on Linux using HDMI, but i’m a little lost.
I don’t see any reason to keep Plasma and Steam at 1080p. Just go 4K. Your desktop (Plasma) and Steam will be much crispier. In games themselves, use 1080p or some FSR if you are OK with it.
Yes, VRR is not available over HDMI.
Thanks! Isn’t freesync the AMD version of VRR that works with HDMI?
Yes it is, but AMD drivers for Linux do not support HDMI 2.1 which is required for VRR (Freesync). The hardware is capable of HDMI 2.1, drivers (software) is not.
This is an unfortunate consequence of drivers being open source. HDMI forum (a group of companies behind HDMI standard) has explicitly prohibited AMD to implement support for HDMI 2.1 because it would violate their patents. Closed source drivers for which AMD paid HDMI royalty (Windows drivers for example) are OK as far as HDMI forum is concerned.
I was researching a little more and you can enable 4k freesync on HDMI 2.0, but the display will convert to 4:2:0 subsampling and probably lose HDR because of bandwidth limitations.