I have a dell inspirion 5720 with Intel HD 4000 with Nvidia GT 630M, running ubuntu 12.10 64bit.
I installed bumblebee first, and worked, after that primus, and it worked again. After that I installed nvidia-experimental-310 (310.14) and changed both bumblebee.conf and the run file in /usr/bin/primusrun.
optirun runs fine and gained a 10 FPS boost
primusrun gives this error:
$ primusrun glxspheres primus: fatal: failed to load any of the libraries: /usr/lib/nvidia-experimental-310/libGL.so.1:/usr/lib32/nvidia-experimental-310/libGL.so.1 libnvidia-tls.so.310.14: cannot open shared object file: No such file or directory /usr/lib32/nvidia-experimental-310/libGL.so.1: wrong ELF class: ELFCLASS32
i dont know why. and i followed this : http://www.webupd8.org/2012/12/use-nvidia-experimental-drivers-310.html