https://bugzilla.kernel.org/show_bug.cgi?id=202445
--- Comment #16 from Clément Guérin (libcg@protonmail.com) --- Nicholas, I found a TODO in the freesync btr code for pre-DCE12 GPUs (pre-Vega?). https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/amd/display/mo...
Could that be related?