I have the same problem with a Belkin KVM. This is not Ubuntu-specific - I had the same problem with Fedora Core 3 & 4. It is kinda fixed in Fedora Core 5. The mouse still freaks out after switching ports, but returns to normal after a couple seconds.
-- mouse eratic with kvm switch https://launchpad.net/bugs/48939 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs