The core of the X.Org configuration is the xorg.conf configuration file, located in the /etc/X11 folder. This configuration file contains all of the settings detected by X.Org when you installed Ubuntu.
The xorg.conf configuration file contains several sections, each defining a different element of the input and output system. Each section itself may contain one or more subsections that further define the input or output device. The basic format of a section looks like this:
# Comment for a section Section "Name" EntryName EntryValue
Subsection "Subname" EntryName EntryValue
The section and subsection areas consist of a name/value pair that defines a setting for the device, such as the type of mouse or the available viewing modes of a monitor.
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