Unfortunately, although my card is exactly the same as yours, that command lead me to a wallpaper-only screen and a mouse pointer. Did you do something else, some xorg.conf modification? Or everything else is out-of-the-box settings in your system?
Oh, I forgot to mention... I'm tryng all of this in a LiveUser session through as USB stick; dont know if it is relevant...
Ok, first you must do all the instructions psyke83! had posted (especially xorg driver).
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