Comment 87 for bug 1288572

yep, confirm the problem

latest kernel install killed the switch (I think). I tried many things and nothing.... (black screen)

- update to nvidia346
- change alternatives manually (without prime)
- desactivate an eventual "ghost display"
- ....

All changes I made & my config >> http://goo.gl/QIimU0

The nvidia card does not work, the black screen is not due to an unknown display >> can not log in background.

I didn't try with lightdm to confirm last hypothesis. I will asap.