Alt+Ctrl+F1 restarts x server - no virtual console

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http://www.linuxquestions.org – I installed latest stable debian lenny. However when I want to switch to a virtual console by pressing Alt+Ctrl+F(1-6) the X server is restarted and I get the gdm login screen. When I kill gdm, virtual console switching works fine. How to switch a to a terminal and return to my X session by pressing Alt+Ctrl+F7? (HowTos)