Comment 6 for bug 1283439

Hello, I found a solution and now everything works perfectly : nvidia-prime, bbswitch and gdm.

http://forum.ubuntu-fr.org/viewtopic.php?id=1557871

I will translate the whole procedure asap.

kernel > 3.13.0-24-generic
nvidia-prime > 0.6.2
bbswitch-dkms > 0.7-2ubuntu1
gdm > 3.10.0.1-0ubuntu4~trusty2
nvidia > 331.67-0ubuntu1~xedgers14.04.2