you are already using xinerama/twinview..
the logfile does enable Randr, but the driver apparently can't use it
with twinview.
** Package changed: xorg (Ubuntu) => nvidia-graphics-drivers-180
(Ubuntu)
** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
Status: New => Invalid
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RANDR extension missing
https://bugs.launchpad.net/bugs/397362
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