Nvidia cards will also have this problem when they turn of KMS (nomodeset or 
nouveau.modeset=0) .  At present it is likely to be a lot worse for them; they 
will possibly only have 16 colours due to the limitations of the openfirmware 
framebuffer.  To solve this you will have to build back in the legacy 
framebuffers:
 
-CONFIG_FB_RIVA=m
-CONFIG_FB_NVIDIA=m
+CONFIG_FB_RIVA=y
+CONFIG_FB_NVIDIA=y
 
This will disable KMS by default, but it can be re-enabled with the 
video=ofonly parameter.  It will make the nouveau setup the same as radeon's 
current setup.

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https://bugs.launchpad.net/bugs/1040526

Title:
  Graphics dithered on Desktop image

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