That worked. Apparently the top-right corner is set, by default, to be a middle-click. The bottom-right corner, I've since learned, is a right click. None of this makes any sense to leave enabled since I have two physical buttons below the trackpad.
Thanks for helping me debug this. Hopefully it'll be easier for people to fix in the future. For reference, here's what I added to my /etc/X11/xorg.conf to fix the issue permanently: Section "InputClass" Identifier "touchpad" Driver "synaptics" MatchIsTouchpad "on" Option "RTCornerButton" "0" Option "RBCornerButton" "0" EndSection -- 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/1511496 Title: Synaptics touchpad pastes when clicked in the top-right corner To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1511496/+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