I have recently upgraded my Ubuntu 12.10 to the Ubuntu 13.04 alpha to test it.
I'm doing all updates manually every day but I still have a little problem
When I suspend my laptop I get a black screen later and can't login.
The only output I can get is using a second monitor and go to command line interface whith alt-ctr+F1.
I tried this solution: deleting ~/.config/monitors.xml
I tried : sudo dpkg-reconfigure lightdm
but still have the same problem :/