ATI RV6 10 [Radeon HD 2400 XT] dual video card support

[Jin Guojun]

Link below is the card specification:
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-2000/hd-2400/Pages/ati-radeon-hd-2400-gpu-specs.aspx

According its spec., this video card has two independent display controllers.
However, X -configure detects only one controller, but after startx, xrandr shows two controllers. 
The question is that is this video card fully supported by X and FreeBSD?
If so, how to use X to configure it for two displays?

-Jin


% xrandr 

Screen 0: minimum 320 x 200, current 1600 x 1200, maximum 1600 x 1600

DVI-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm

   1600x1200      60.0*+

   1280x1024      75.0     60.0  

   1152x864       75.0  

   1024x768       75.0     60.0  

   800x600        75.0     60.3  

   640x480        75.0     59.9  

   720x400        70.1  

DVI-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm

   1600x1200      60.0*+

   1280x1024      75.0     60.0  

   1152x864       75.0  

   1024x768       75.0     60.0  

   800x600        75.0     60.3  

   640x480        75.0     59.9  

   720x400        70.1