> Right now I upgraded my GPU to 9070XT - I'm still not sure if that would work on Linux yet because of driver support delay
You can install AMDs driver from their repo directly, it works just fine (using it every day).
> I still cannot use my LG C4 as a monitor in full capacity because AMD on Linux does not support HDMI 2.1
That will never be possible. To prevent pirates from breaking it (lol), HDMI has decided to keep HDMI 2.1 secret. No open source version of HDMI 2.1 can exist.
That said, AMD's driver repo includes both the open source drivers and some proprietary versions of the driver, maybe that'll work for you.
Another option would be using a displayport output and a DP to HDMI converter, as e.g. Intel is using for their GPUs.
You can install AMDs driver from their repo directly, it works just fine (using it every day).
> I still cannot use my LG C4 as a monitor in full capacity because AMD on Linux does not support HDMI 2.1
That will never be possible. To prevent pirates from breaking it (lol), HDMI has decided to keep HDMI 2.1 secret. No open source version of HDMI 2.1 can exist.
That said, AMD's driver repo includes both the open source drivers and some proprietary versions of the driver, maybe that'll work for you.
Another option would be using a displayport output and a DP to HDMI converter, as e.g. Intel is using for their GPUs.