The Duo-View display mode is to display same content on two display devices. Different VIA chipset supports different display combinations.

To light Duo-View display mode, you must pay attention to the following aspects.

• Firstly, it is mandatory to specify the active devices which you intend to use. The names of the two display devices are separated by a comma, and the former is the primary display device and the latter is the secondary. The mode setting of the secondary display device follows the primary.
• Secondly, if the display device is connected by external transmitter/encoder, or one of them is internal LCD panel, it's a must to set the digital port right.
• Thirdly, regarding to other mandatory or optional options for different display devices, get more information from Part III Chapter 1, Output Device Configuration Instructions.

For example,

(1) Internal CRT + Internal LCD

       Section "Device"
               Driver   "via"
               VendorName  "VIA Tech"
               BoardName   "via"
               Identifier  "Device0"
               Option "ActiveDevice" "CRT, LCD"
               Option "LCDPort"      "LVDS0"
               Screen 0
       EndSection 

(2) Internal CRT + External DVI

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

(3) External LCD + External TV

       Section "Device"
               Driver   "via"
               VendorName "VIA Tech"
               BoardName "via"
               Identifier "Device0"
               Option "ActiveDevice"  "LCD, TV"
               Option "LCDPort"       "DVP0"
               Option "TVPort"        "DVP1"
               Option "TVType"        "PAL"
               Option "TVOutput"      "S-Video"
               Screen 0 
       EndSection 

The configuration for other display device combinations could derive from the samples.

Regarding to configuring two display devices of the same type, i.e. two CRTs, two LCDs, two TVs, please refer to Part III Chapter 1, Output Device Configuration Instructions, it's demonstrated in the related sections.