I have a Sony Vaio E series laptop. And I recently installed Ubuntu 12.10 on it. It was running all smooth without any problem, till I updated it (as we have to do after any normal installation of Ubuntu). But as I updated the system, it asked me to restart the system (which again is a normal thing), but after reboot, when the ubuntu 12.10 login screen came, it was all flickering. Nothing was properly visible, though I heard the sound, when the login screen come's. Interestingly when I took the mouse to the top of the screen, it was partly visible. Also when I closed the lid the system went to sleep, and after resuming the screen was all Ok again.
But still, can you help with this problem of flickering.