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 -- switching from X to VT then back to X not working (ACPI related?) https://bugs.launchpad.net/bugs/526698 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers-180 in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp