Configuring A System For Dual-Channel Operation - Silicon Graphics Prism Hardware User's Manual

Configuring a System for Dual-Channel Operation

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To configure a system for dual-channel operation, follow the steps in this section.
Note: If any pipes managed by an X server have their second channel enabled, then
every pipe managed by that X server must have its second channel enabled.
Note: Both channels on a pipe must have the same display resolution.
1. Create a copy of the XF86Config file to be customized for dual-channel operation:
# cp /etc/X11/XF86Config /etc/X11/XF86Config.DualChannel
2. Edit the new XF86Config.DualChannel file to include the following line at the
end of each "Device" section:
Option "DesktopSetup"
where mode is one of the following:
"0x00000100" [this mode clones the managed area]
"0x00000200" [this mode scales the managed area by 2 horizontally]
"0x00000300" [this mode scales the managed area by 2 vertically]
(see "Example "Device" Section for Dual Channel" on page 128).
Note: All pipes managed by the same X server must be set to the same mode.
3. When using monitors or monitor cables which do not conform to the VESA Display
Data Channel (DDC) standard, append the following entry in the "Device" section
to enable proper display configuration:
Option "NoDDC" "on"
4. Make a backup copy of the default /etc/X11/gdm/gdm.conf file:
# cp /etc/X11/gdm/gdm.conf /etc/X11/gdm/gdm.conf-old
mode
XF86Config File Changes
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