Combining the above two ideas you could add a new config file (make sure its name loads before "10-radeon.conf"):
Section "OutputClass" Identifier "MyRadeon" MatchDriver "radeon" Driver "modesetting" EndSection
Combining the above two ideas you could add a new config file (make sure its name loads before "10-radeon.conf"):
Section "OutputClass"
Identifier "MyRadeon"
MatchDriver "radeon"
Driver "modesetting"
EndSection