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You need to install Bumblebee and use bbswitch.

In short. After installing Bumblebee, you will have bbswitch program. An you could use it to enable and disable your NVIDIA. But if would like to disable it during boot, then create file /etc/modprobe.d/bbswitch.conf containing options bbswitch load_state=0, and this should do the trick.

If you prefer manual turning ON and OFF, then this will show you the state of your card:

# cat /proc/acpi/bbswitch
0000:01:00.0 ON

and this will turn off it:

echo OFF > /proc/acpi/bbswitch

More information in bbswitch README