So, generally Freesync seems to be working pretty OK for (excluding known limitations). However, in a few games, I get momentary/random black/blank screens for a few seconds every few minutes. So far, the easiest game to reproduce it with is anything in the Total War series (Thrones of Britania, Warhammer 1&2, Attila), which covers both OpenGL and Vulkan ports, along with in house ports (Attila by CA) and Feral Ports (all the rest). It is a pretty annoying issue, and reading other reports that things like that have been cleared up on the Windows side even on not “officially” supported monitors.
Distro: Arch Linux
Desktop: KDE/Plasma 5.15.2, Frameworks: 5.55.0
Monitor: VG271UP via Display Port