WarningBe careful if 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 themonitor's picture area.• HorizSync — Specifies the range of horizontal sync frequencies compatible with the monitorin kHz. These values help the X server determine the validity of built in or specified Modelineentries 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 Modelineentries for the monitor.• Modeline — An optional parameter which specifies additional video modes for the monitor atparticular resolutions, with certain horizontal sync and vertical refresh resolutions. Refer to thexorg.conf man page for a more detailed explanation of Modeline entries.• Option "" — An optional entry which specifies extra parameters for thesection. Replace with a valid option listed for this section in the xorg.confman page.3.1.8. DeviceEach Device section configures one video card on the system. While one Device section is theminimum, 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 byusing the X Configuration Tool. For more about using the X Configuration Tool, refer to thechapter titled X Window System Configuration in the Red Hat Enterprise Linux SystemAdministration Guide.The following example illustrates a typical Device section for a video card:Section "Device" Identifier "Videocard0" Driver "mga" VendorName "VideocardChapter 7. The X Window System106
