This ended up being a GTK3 bug, not an xorg bug, see https://bugzilla.redhat.com/show_bug.cgi?id=1245247. Closing again
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/925785 Title: Starting to scroll is erratic with edge scrolling on touchpad or mouse scrollwheels To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/925785/+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