The configuration in xorg.conf specifically breaks tablet support for tablet users by having ForceDevice ISDV4. These lines are to support tablet *PCs* that use wacom's interface.
-- wacom entries appear even when not having a tablet https://launchpad.net/bugs/63862 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs