7.3.3. X server configuration
The X distribution that used to come with Linux,
XFree86, uses the configuration file XF86Config for its initial setup. This file
configures your video card and is searched for in a number of
locations, although it is usually in /etc/X11.
If you see that the file /etc/X11/XF86Config is present on your system, a
full description can be found in the Info or man pages about XF86Config.
Because of licensing issues with XFree86, newer systems usually
come with the X.Org distribution of the X server and
tools. The main configuration file here is xorg.conf, usually also in /etc/X11. The file consists of a number of sections
that may occur in any order. The sections contain information about
your monitor, your video adaptor, the screen configuration, your
keyboard etcetera. As a user, you needn't worry too much about what
is in this file, since everything is normally determined at the
time the system is installed.
Should you need to change graphical server settings, however,
you can run the configuration tools or edit the configuration files
that set up the infrastructure to use the XFree86 server. See the
man pages for more information; your distribution might have its
own tools. Since misconfiguration may result in unreadable garbage
in graphical mode, you may want to make a backup copy of the
configuration file before attempting to change it, just to be on
the safe side.