that sounds like a broken lapdock... there ain't no trick to that... it's just supposed to work.... have you tried the other fn key on the right... next to the pg up key?? just to make sure it's not a broken key on the left...
Got the lapdock 2 days ago fresh from the 1day sale. Yes I've tried the other fn key on the right. Everything else seems to work on the lapdock. Thanks for the response.
Just played around with mine... a lot of the fn keys don't do anything... volume and screen brightness should work... "del" doesn't work , it's always backspace... pg up, pg down, home , end... don't seem to work... some of the F keys work... like F1 is menu... F3 is dialer... F5 is google search... just throwin that out there