AHA!! I also have a Logitech wireless mouse that seems to conflict and cause the rapid ticking. Pulling it out and re-inserting appears to solve the problem.
-- Xorg reports USB audio device as a keyboard https://bugs.launchpad.net/bugs/360487 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs