Internal DVI configuration

For internal DVI, you only need to confirm the DVI is configured to be the active display device. For example,

Section "Device"
	Driver   "via"
	VendorName  "VIA Tech"
	BoardName   "via"
	Identifier  "Device0"
	Option "ActiveDevice" "DVI"
	Screen 0 
EndSection 

External DVI configuration

For external DVI, besides configuring DVI to be the active display device, you may need to set the DVIPort. The external DVI could be connected through external DVI transmitter, i.e. VT1632A.

The default value of DVIPort depends on which VIA chipset you use. And if the DVI could not be enabled by the default setting, you can use the following option to set the digital port.

Option "DVIPort" " DFP_HIGH" (or "DFP_LOW", "DVP0", "DVP1")

DVP represents "Digital Visual Port".
DFP represents "Digital Flat Panel Port". They are all physical interfaces.

For example,

Section "Device"
	Driver   "via"
	VendorName  "VIA Tech"
	BoardName   "via"
	Identifier  "Device0"
	Option     "ActiveDevice" "DVI"
	Option     "DVIPort" "DVP1 "
	Screen 0 
EndSection

DVI Related Options

There are some specified options for DVI configuration. The options belong to the Section Device.

Option "Refresh" "integer"

This option set the refresh rate, which is the number of times in a second that display hardware draws the data it is being given. Increasing the refresh rate decreases flickering, thereby reducing eye strain. However, if a refresh rate is specified that is beyond what is recommended for the display, damage to the display can occur. For the supported resolution and refresh rate, you can get more information from Part III. Chapter 5. Depth and Resolution Configuration.