This line from the log looks very suspicious:
(II) NVIDIA(0): Virtual screen size determined to be 1600 x 1280

Type:
sudo nvidia-settings

and try to set the correct resolution from there. Then save your
settings and restart the Xserver.

Let me know how it goes.

-- 
nvidia graphics card error when you install drivers
https://bugs.launchpad.net/bugs/271618
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