Questions about X.Org Server (commonly known as Xorg Server, XServer or Xorg), the software that runs the X window system used by most desktop window managers (GNOME, KDE, etc)
The Xserver is capable of creating its own configuration file.
As root just run: X -configure. The Xserver will then load each driver module, probe for the driver and create a configuration file. The configuration file will be stored in the home directory of the user who started the Xserver (usually /root).
It's called xorg.conf.new so another config file that may exist in this directory will be overwritten.