Originally Posted by Timothy Miller
SUPPOSEDLY there is a modded BIOS that adds it
I know that at least one of the Dell laptop models had a 'force nVidia/disable optimus' option that was deleted on later versions of the BIOS. Sorry, I cant remember the exact model number, but IIRC it was at least close to L502x.
If the modded BIOS is an older BIOS with the 'force nVidia/disable optimus' option, updated with newer code but keeping the 'disable' option it might be worth trying. If its just a modded standard BIOS, I wouldnt try it.