will i had never heard of it till you mentioned it
however ive been doing some research, and it appears that the Nvidia and intel parts of the chip are "integral"
So turning it off, isnt possible. it basically puts the Nvidia part of the card to sleep and wakes it when more demanding apps require it.
Try updating the drivers, apparently they arent so easy to find, and i can only find reference to issues dating back to 2010.. so unless your laptops been sat on the shelf a while, id have thought youd have later versions than the people complaining int he past lol.