N900 Physical keyboard lights not working

Hi,
Physical keyboard lights are not working when display is fully up. Keyboard lights work only when display is halfway up. Lights go off just a millimeter before when display reach it top position.
Can anyone suggest is this a software issue or there is something physically wrong with phone (slider-switch is slightly misplaced or broken)?
Thanks.
Solved!
Go to Solution.

Thanks to all for content-rich reply..
-> to cpitchford: I downloaded package and entered the commands you suggested. X terminal reply after "sudo gainroot" was "Enable RD mode if you want to break your phone". I'm not at home with RD mode, so I rather don't mess with it.. After all it was mentioned to just monitor when the switch is on/off? Keyboard light comes ON when display bottom edge reaches middle of Q-letter (on keyboard) and go OFF after the "clunk". Then, if I slightly press down the display (1mm) the keyboard lights come ON again.
_> to DrEJV :I think the background light sensor is working OK - when I cover the light sensor with finger ,display dimes slightly. Problem is that keyboard light don't work at all when display is fully open, not even in total backround blackout.
Think that there might be wrong something with physical switch, as jlpils suggested, because now I know that they SHOULD be lighted
thanks again

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