[No Longer Issue: unknown resolution] "Scaled by System" is not working
Even though I have "Scaled by the system" enabled, Steam is still not correctly scaling
Solution
I did fix it tho. I used
rpm-ostree kargs --append=amdgpu.dcdebugmask=0x400 and rebooted. Whether it was just the reboot that "made it work" (which happens sometimes) or if the karg actually did something, idk