How to (un)dock IBM Thinkpad X41 from X4 Dock(ing station) successfully?

This is preliminary, but pending further findings I think this issue has been resolved by means of normal updates: it seems to be working just fine now (using the blue undock button on the docking station when undocking; and cycling through fn f7 if using an external monitor), hot-warm-lukewarm docking all seems to be handled well now.

Thanks, UBUNTU !

UPDATE: even after (accidentally) undocking (while a lot of stuff was running) without pressing the blue undock button on the docking station the system remained stable / responsive / "there" / reliable / etc (only a quick "toggle" of fn f7 needed to get the display(s) back in order). So, finally, it just works !! yeah :D