Have you gone into Windows resolution settings and enabled the 2nd display? By default, only 1 display is used. Right click the desktop, click on screen resolution, and there will be settings to detect, enable and how to use the 2nd display.
Only one display appears, even when I hit detect (same in Catalyst). But I will try it again with the drivers uninstalled to see if it shows the second display then.
@kunthakenthe It only shows up on the TV for bios/predesktop content and when video drivers are uninstalled.