I'm trying to disable Vsync on my BARTS radeon card (source game stuck at 60 fps)
I was directed to the file /usr/share/x11/xorg.conf.d/10-amdgpu.conf to add Option "SwapBuffersWait" "false"
I'm finding I have no permission to edit the file? What gives?

Any responses / wishes for luck appreciated. I have no idea what I'm doing.