There is nothing odd in the Xorg.0.log that you posted from what I can
see, those lines are supposed to be there on VT switch. Can you please
run apport-collect 526698 to attach all the info we need to look into it
more?
** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
Status: New => Incomplete
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switching from X to VT then back to X not working (ACPI related?)
https://bugs.launchpad.net/bugs/526698
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