Does this happen reproducibly? Does your monitor connection also include an USB connector (often they have a builtin hub)? I see some USB disconnects in the log, and wonder if that is from the touchpad (which might be internally wired through USB) or from the monitor.
** Changed in: xorg (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/911086 Title: Touchpad stops working after unplugging monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/911086/+subscriptions _______________________________________________ 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