Originally Posted by DougMorgan
This is my understanding of how it works with a modern AMD/ATI card and win7.... if this works differently with Nivdia or under Vista/XP ignore this....
There is no duplicating one to the other. There is one desktop displayed on both monitors at exactly the same size.
Again with an ATI card if you check the resolution it may not be at what you are thinking. Each monitor has certain resolution modes it will support and the card will only chose a mode that is supported by the card AND both monitors and that mode has to be small enough to fit on both screens. This will almost certainly NOT be the optimum setting for either monitor unless they are the same resolution (I.E. both 1920x1080). With LCD/LED type monitors anything other than the native, optimum resolution setting normally looks pretty poor.
Your mileage may vary of course and ignore this if you have other hardware that functions differently......
Suggest you use the Catalyst 11.2 ver or whatever is available this month.
1) run the Catalyst Control center
2) select desktop management at the left
3) if the TV & AVR are on, you should see an overlayed square at the bottom left of the representation of the display/screen (the large one)
4) placing the arrow on the overlayed squares a popup will say "this desktop is duplicated across 2 displays".
5) there will be 2 icons to represent the monitor & TV & both will have a "1" at the upper left corner
6) placing the arrow at each icon, you will see the same resolution for the TV & monitor
7) doing a rt click on each icon you will see "disable, identify display, extend" for the monitor (default); you will also see "make preferred" for the TV
8) The 1st item in the desktop management is "creating & arranging desktops" & most likely what is displayed when selected
9) if you select the "extend" you will see that the TV is now labeled "2" at the upper left.
10) if you then rt click on the TV you will see "duplicate"
11) Then select the "desktop properties" at the list under the "desktop management" & you will see res & info for the monitor BUT
12) you can then hit the up arrow at the right of the menu bar to select "2 desktop display"
13) in my case, I see the default of 720p, etc under the HDTV; 1000i & 1000p is available to be selected
14) But if you select "basic" in the box, res of 1080p is available under HDTV (probably a bug in not listed 1st time)
15) closing the "basic" list, the 1080p is still available for selection as the res for the TV in extended mode.
Anyway, if it helps, good; if not ignore. I think the nvidia allows a different resolution for the TV & overscans the monitor; at least on the my card that is stored away; but my model doesn't do sound with hdmi & the docs say so.