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In former drivers there was an option in the nvidia-settings GUI for that. I also tried it manually:

nvidia-settings --assign=GPUScaling=131074

Which gives me:

ERROR: The attribute 'GPUScaling' specified in assignment 'GPUScaling=131074' cannot
       be assigned (it is a read-only attribute).

I also do not know if 131074 is a correct value. Other values give the same error. Do I have to revert to an older driver or is there a hack that can prevent my GT8800 from doing GPU scaling.

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There are still options described in the documentation for xorg.conf.

Option "FlatPanelProperties" "string"

This option requests particular properties for all or a subset of the connected flat panels.


Recognized properties:

  • "Scaling": controls the flat panel scaling mode; possible values are:
    • 'Default' (the driver will use whichever scaling state is current),
    • 'Native' (the driver will use the flat panel's scaler, if possible),
    • 'Scaled' (the driver will use the NVIDIA GPU's scaler, if possible),
    • 'Centered' (the driver will center the image, if possible),
    • and 'aspect-scaled' (the X driver will scale with the NVIDIA GPU's scaler, but keep the aspect ratio correct).

So you either use Native and have the image scaled by the flat panel or Centered and have no scaling applied at all.

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can you give me some details how i can set this up. I do not have an xorg.conf. Do I set this option in the .nvidia-settings-rc? – Juve Nov 8 '12 at 8:35
You can generate a xorg.conf file with nvidia-settings. Option lines like these are usually added to the device section. There a also examples on how to configure multiple monitors. – LiveWireBT Nov 8 '12 at 12:19
But doesn't that contradict to the xorg.conf-free configuration model that Ubuntu adopted since several releases? You say there is now way around that? I still remember the many hours spent tweaking my xorg.conf (multi monitor) in 2006 ;). I do not want to go back, I'd rather use the old driver. – Juve Nov 9 '12 at 9:10
You just configure the necessary parts that you specifically want to configure yourself, everything else is still automatically configured. – LiveWireBT Nov 9 '12 at 19:24

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