Chapter 6. The X Window System

101

  VertRefresh

  Lists the vertical refresh range frequencies supported by the monitor, in

kHz. These values are used as a guide by the XFree86 server so that it will know whether to

use a particular

Modeline

entry's values with this monitor.

Screen

Binds together a particular

Device

and

Monitor

that can be utilized as a pair and contain certain

settings. You must have at least one

Screen

section in your configuration file. The following

options are common:

  DefaultDepth

  Tells the

Screen

section the default color depth to try in bits.

8

is the

default,

16

provides thousands of colors, and

32

displays millions of colors.

  Device

  Signifies the name of the

Device

section to use with this

Screen

section.

  Identifier

  Identifies the

Screen

section so that it can be referred to by a

ServerLayout

section and be utilized.

  Monitor

  Tells the name of the

Monitor

section to be used with this

Screen

section.

You may also have a

Display

subsection within the

Screen

section which tells the XFree86

server the color depth (

Depth

) and resolution (

Mode

) to try first when using this particular mon 

itor and video card.

ServerFlags

Contains miscellaneous global XFree86 server settings. These settings may be overridden by

options placed in the

ServerLayout

section. Among the most useful settings:

  DontZap

  Prevents the use of the [Ctrl] [Alt] [Backspace] key combination to immediately

terminate the XFree86 server.

  DontZoom

  Prevents cycling through configured video resolutions using the [Ctrl] [Alt] 

[Keypad Plus] and [Ctrl] [Alt] [Keypad Minus] key combinations.

ServerLayout

Binds together a

Screen

section with the necessary

InputDevice

sections and various options

to create a unified collection of preferences used by the XFree86 server as it starts. If you have

more than one

ServerLayout

section, and the one to use is not specified on the command line

when bringing up the XFree86 server, the first

ServerLayout

section in the configuration file

is used.

The following options are used in a

ServerLayout

section:

  Identifier

  A unique name used to describe this

ServerLayout

section.

  InputDevice

  The names of any

InputDevice

sections to be used with the XFree86

server. Most users will only have two lines here,

Keyboard0

and

Mouse0

, the first keyboard

and mouse configured for the system. The options

CoreKeyboard

and

CorePointer

refer to

the fact that these are the preferred keyboard and mouse, respectively, to use with the XFree86

server.

  Screen

  The name of the

Screen

section to use. The number to the left of the name of the

Screen

section refers to the particular screen number to use in a multi head configuration.

For standard single head video cards, this value is

0

. The numbers to the right give the X and

Y absolute coordinates for the upper left corner of the screen, by default

0 0

.

Below is an example of a typical screen entry:

Screen

0

"Screen0" 0 0