The X server configuration determines how the display will be set
up??”which devices, in which operating modes, in which combination will be used.
For a simple configuration with one mouse, keyboard, monitor, and video card,
using a reasonable resolution and scan rate, configuration is pretty straightforward.
In fact, the X server can configure itself in the absence of a configuration file, or it
can generate a default a basic configuration file (Section 3.4). But as soon as a special
resolution or scan rate is desired or if multiple devices of the same kind are used,
the complexity of the configuration can rise quickly. If there are two screens, the
server needs to know which is on the left and which is on the right; if there are multiple
mice, the server needs to know which ones you want it to manage.
Most distributions automatically generate a reasonable configuration file when they
are installed, and also provide graphical tools for adjusting the configuration. However,
none of these tools provides complete control over all of the configuration
options??”and if the display is misconfigured and unusable, it??™s hard to bring up a
graphical tool to correct the problem!
This chapter covers the configuration of the X.
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