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Well, it is the same case for me. When choosing 2560x1440, the display resolution shows 5120x2880 which is definitely inaccurate. I guess it just 'happens' to match with display's resolution (3840x2160) when choosing 1920x1080 since the display's resolution in system report is somehow...

Maybe try to delete framebuffer-patch-enable and shikigva=80 and see what happens? Headless framebuffers(where the dGPU is the display out) do not need framebuffer-patch-enable and framebuffer-stolenmem. shikigva=80 is mostly related to iGPU performance as well and I won't bother using this...

can u post your config list?

So in your system report or monitor info it doesn’t say 3840x2160? Have you tried holding alt and click scaled in system preference/display to see all possible options?

Definitely not sharper than 5k. When it says “looks like 1920x1080” it should actually be 4K with the largest scale.

rx 5500 xt should definitely work with 4k. Check config

If you switch to OpenCore, everything becomes easy

RX 5700 XT +1

Hello, I have just updated to Big Sur and the os will no longer output 4K @ 144Hz to my monitor. My setup is: CPU: i9-9900K Motherboard: GIGABYTE Z390 AORUS PRO WIFI GPU:RX 5700 XT Monitor:LG 27GN950-B (Capable of 30-bit colors, HDR, 4K, 144Hz) Before updating (in Catalina), 4K@144Hz works...

I also wanna know how to fix it. Tried a lot of options but no luck.

so, no solution so far?