You've run into GTK3's support for smooth-scrolling, which does not rely on mapping buttons 4/5 as “mouse wheel” buttons. What's happening after you remapped the buttons is GTK3 is receiving a “scroll down by 12.4 increments” message, and *also* receiving a “the scroll-up button was pressed” message.
In order to reverse the scroll order you additionally need to reverse the scroll axis; you can do this with the “xinput” tool by providing a negative value for the scroll distance. ** Changed in: xserver-xorg-input-synaptics (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/968536 Title: Natural Scrolling broken with software-center in 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/968536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs