Hi,I'd like to help you resolve the issue (bumblebee works flawlessly on my debian unstable system). Could you please share a bit more information?
Which nvidia packages are installed? (e.g. $ dpkg --get-selections | grep nvidia)
What is the full log output of the secondary Xorg server? This should be stored in '/var/log/Xorg.8.log', which should be freshly created when running e.g. "optirun -b none true"
-- Kind regards, Felix Dörre
