DP is the acronym for display port. VIA chipset VX900 starts to support DP devices.

The support combination of DP depends on the capability of mother boards. Some support the DP muxed with internal HDMI, while others don't.

The DP muxed with internal HDMI is connected through the DP slot on board. The DP muxed with PCI-E is connected through a PCI-E card as DP adapter.

For the DP muxed with PCI-E, you need to confirm that DP2 is configured to be the active display device. For example,

Section "Device"
        Driver   "via"
        VendorName  "VIA Tech"
        BoardName   "via"
        Identifier  "Device0"
        Option	"ActiveDevice" "DP2" 
EndSection 

To enable the DP muxed with internal HDMI, you need to configure DP to be the active display device.

DP Related Options

There are some specified options for DP 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.