It used to be the case (since the XFree86 days and maybe earlier) that X server configuration files are to be found under /etc; namely in /etc/Xorg. However, recent distributions (at least, recent Arch and Debian) put it under /usr/share/X11. Why is that? Doesn't host-level configuration belong under /etc ?
Why have the X server configuration files moved from /etc/Xorg to /usr/share/Xorg?
xorg;lsb