Here I walk you through the steps to enable Freesync on Linux. TLDW switch to xorg, make sure only one display monitor is enabled, and flip the switch in the .conf and make sure your freesync is turned on in the monitor's osd menu
sudo nano /etc/X11/xorg.conf.d/20-radeon.conf # this will create the file that contains the setting enabling Freesync (variable refresh rate)
contents of the .conf =
Section "Device"
Identifier "AMD"
Driver "amdgpu"
8-bit or 10-bit colors 24 or 30
Using 10-bit breaks Chromium and Chrome
DefaultDepth 24
Option "TearFree" "1"
Option "VariableRefresh" "true"
EndSection
You dont need the commented out lines (the ones with the #)