Comment 16 for bug 1078977

I think I have fixed this on my computer... I blacklisted nouveau in /etc/modprobe.d/blacklist.conf (the nvidia drivers already did this in nvidia-graphic-drivers.conf but just to be sure...). Then I have removed the nouveau drivers, reinstalled nvidia-current and updated initramfs (sudo update-initramfs -u -v). When I rebooted lightdm was working but when I log in it just keep restarting himself, so I went to TTY1, killed lightdm and executed it from command line to see what was happening. The problem was that .Xauthority had a wrong owner. I just chown it to the proper user and now everything is working.

I don't know if all the steps are necessary because reinstalling the nvidia drivers also rebuild the initramfs (or I think so...). Anyway, my system is 100% operative now.