Im trying to find out how to see if bumblebee which i installed on my 12.10 installation on my k55vd asus laptop...
How can know for sure that bumblebee is turning the nvidia off?
I think this is what you're looking for (run at a command line):
If the discrete card is disabled, it will show
Or, if you're using KDE, you can add the widget "Bumblebee Indicatior" (sic) . It shows an icon that's either black or yellow depending on the video card status.