I have Debian Jessie; I installed the bumblebee drivers for my video card nvidia geforce 720m.
How do I activate the drivers and to use only his nvidia card?
To install the drivers, I used the command
apt-get install bumblebee primus
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You have to check if your UEFI support this feature. On my laptop (Lenovo z70) I was not able to permanently enable the discrete nvidia gpu. That's right anyway, you shouldn't use the discrete video card when not needed: this would lead to heavy power consume and more heat. You should activate the discrete video card only when really needed (using optirun, or primus) for example when gaming on when working with graphics intensive softwares.