It might be worth noting that due to a bug, some Optimus laptop (that has customized N-card) will have problem recognizing the NV card. Upon loading nVidia's driver/dmesg, you'll see error "NVRM: failed to copy vbios to system memory."

A hack can be found here:https://github.com/Bumblebee-Project...novo/README.md

BTW, thanks for the awesome guide.