Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual page 486

Chapter 31. The X Window System
Warning
Be careful when manually editing values in the Monitor section of /etc/X11/
xorg.conf. Inappropriate values can damage or destroy a monitor. Consult the monitor's
documentation for a listing of safe operating parameters.
The following are commonly entries used in the Monitor section:
• Identifier — Specifies a unique name for this Monitor section. This is a required entry.
• VendorName — An optional parameter which specifies the vendor of the monitor.
• ModelName — An optional parameter which specifies the monitor's model name.
• DisplaySize — An optional parameter which specifies, in millimeters, the physical size of the
monitor's picture area.
• HorizSync — Specifies the range of horizontal sync frequencies compatible with the monitor in
kHz. These values help the X server determine the validity of built-in or specified Modeline entries
for the monitor.
• VertRefresh — Specifies the range of vertical refresh frequencies supported by the monitor, in
kHz. These values help the X server determine the validity of built in or specified Modeline entries
for the monitor.
• Modeline — An optional parameter which specifies additional video modes for the monitor at
particular resolutions, with certain horizontal sync and vertical refresh resolutions. Refer to the
xorg.conf man page for a more detailed explanation of Modeline entries.
• Option "<option-name>" — An optional entry which specifies extra parameters for the section.
Replace <option-name> with a valid option listed for this section in the xorg.conf man page.
31.3.1.8. Device
Each Device section configures one video card on the system. While one Device section is the
minimum, additional instances may occur for each video card installed on the machine.
The best way to configure a video card is to configure X during the installation process or by using
the X Configuration Tool. For more about using the X Configuration Tool, refer to
Window System Configuration.
The following example illustrates a typical Device section for a video card:
Section "Device" Identifier "Videocard0" Driver "mga" VendorName "Videocard vendor" BoardName
"Matrox Millennium G200" VideoRam 8192 Option "dpms" EndSection
The following entries are commonly used in the Device section:
• Identifier — Specifies a unique name for this Device section. This is a required entry.
• Driver — Specifies which driver the X server must load to utilize the video card. A list of drivers
can be found in /usr/share/hwdata/videodrivers, which is installed with the hwdata
package.
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Chapter 32, X