Comment # 3 on bug 1183676 from Carl Lieberman

And they're right, Freesync does work with this card on the other distros I've
tested.

I've tried to do a little more digging into these semi-persistent effects of
Sway. There's the strangeness of the stuttery cursors at 48 Hz despite the
monitor being set at 165 Hz, but trying now to go Sway --> Gnome X11, I can't
even launch VRRTest and instead get

Error: Could not initialize SDL video subsystem (wayland not available)
stack traceback:
    [string "boot.lua"]:777: in function <[string "boot.lua"]:773>
    [C]: at 0x7f5764e96ae0
    [C]: in function 'require'
    [string "boot.lua"]:505: in function <[string "boot.lua"]:380>
    [C]: in function 'xpcall'
    [string "boot.lua"]:787: in function <[string "boot.lua"]:780>
    [C]: in function 'xpcall'

so there's definitely some weirdness sticking around after launching Sway. But
switching switching between X11/Wayland and GNOME/Plasma/Sway sessions is
borderline pathological, and especially for Sway maybe I set some environmental
variables that are interfering with the DEs, so this isn't the part I'm worried
about, it's the complete inability to use VRR under X11.