[trinity-users] kdm-trinity login screen requires Ctrl+Alt+Del to begin

Since installing the latest backport kernel in Squeeze, kdm-trinity login screen shows this: Press Ctrl+Alt+Del to begin This process helps keep your password secure It prevents unauthorized users from emulating the login screen I seem unable to find any info on this behaviour, least of all how to disable it. Aside from a general annoyance I can't run a TDM virtualbox because that key combo will bring up the host's logout screen. I prefer Squeeze generally but need a kernel => than 2.6.38 to support xz decompression Any pointers to a solution? David