why Xrandr is rotating screen only with Nvidia card ?

[prakash viswalingam <prakashv.nlg@xxxxxxxxx>]

Hi 
         I have tried to rotate the screen with the Nvidia card
(Quadro-4) with the Xrandr Extension it was rotated ,but i tried with
the MX440 it was not rotated .

can any one tell me how the Xrandr has been implemented for rotating
the desktop , why it is only working with Nvidia?

If nvidia have done something in their driver to rotate the screen
then what does the Xrandr is doing ?

Thanks in Advance 
V.Prakash

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