nvidia-settings --assign "FlatPanelScaling[DFP]=1"
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Eh. No good, it makes my screen flash black and then back to norma. It doesn't do centered/aspect scaled/etc. I guess this is what they mean by "milage may vary" ?
Ah well, I really really hope it works in the next release...I can't play any games till it's fixed w/o running at 1280x1024 and getting low framerates or dealing with a stretched screen in 640x480.