Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual page 487

• VendorName — An optional parameter which specifies the vendor of the video card.
• BoardName — An optional parameter which specifies the name of the video card.
• VideoRam — An optional parameter which specifies the amount of RAM available on the video card
in kilobytes. This setting is only necessary for video cards the X server cannot probe to detect the
amount of video RAM.
• BusID — An entry which specifies the bus location of the video card. On systems with only one
video card a BusID entry is optional and may not even be present in the default /etc/X11/
xorg.conf file. On systems with more than one video card, however, a BusID entry must be
present.
• Screen — An optional entry which specifies which monitor connector or head on the video card the
Device section configures. This option is only useful for video cards with multiple heads.
If multiple monitors are connected to different heads on the same video card, separate Device
sections must exist and each of these sections must have a different Screen value.
Values for the Screen entry must be an integer. The first head on the video card has a value of 0.
The value for each additional head increments this value by one.
• 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.
One of the more common options is "dpms" (for Display Power Management Signaling, a VESA
standard), which activates the Service Star energy compliance setting for the monitor.
31.3.1.9. Screen
Each Screen section binds one video card (or video card head) to one monitor by referencing the
Device section and the Monitor section for each. While one Screen section is the minimum,
additional instances may occur for each video card and monitor combination present on the machine.
The following example illustrates a typical Screen section:
Section "Screen" Identifier "Screen0" Device "Videocard0" Monitor "Monitor0" DefaultDepth 16
SubSection "Display" Depth 24 Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600"
"640x480" EndSubSection SubSection "Display" Depth 16 Modes "1152x864" "1024x768" "800x600"
"640x480" EndSubSection EndSection
The following entries are commonly used in the Screen section:
• Identifier — Specifies a unique name for this Screen section. This is a required entry.
• Device — Specifies the unique name of a Device section. This is a required entry.
• Monitor — Specifies the unique name of a Monitor section. This is only required if a specific
Monitor section is defined in the xorg.conf file. Normally, monitors are automatically detected.
• DefaultDepth — Specifies the default color depth in bits. In the previous example, 16 (which
provides thousands of colors) is the default. Only one DefaultDepth is permitted, although this
can be overridden with the Xorg command line option -depth <n>,where <n> is any additional
depth specified.
xorg.conf
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