The distro doesn’t matter, the radeon stuff just is a bit rusty.
Try this for /usr/share/X11/xorg.conf.d/10-radeon.conf
Section "OutputClass"
Identifier "Radeon"
MatchDriver "radeon"
Driver "radeon"
Option "AccelMethod" "glamor"
Option "ColorTiling" "false"
EndSection
Then use
xrandr --setprovideroutputsource 1 0 && xrandr --auto