@toni
Hi, the way to "kill" (disable) the nvidia card is through a contributed kernel 
module: 
http://linux-hybrid-graphics.blogspot.com/2009/12/solution-to-switch-off-nvidia-card-in.html
I will check again if a BIOS update is available for my Asus UL50VT, but there 
was no option to change between cards or modes as your Lenovo has :(
The BIOS should have such an option, it is not like choosing at boot time or 
like switching it live, but will do the trick in the mean time.

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support graphics card hot switch
https://bugs.launchpad.net/bugs/312756
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