Recently upgraded to 15.10 (from 14.04 I had to wipe everything to upgrade because of an interrupted initial upgrade from 14.04 to 14.10), and after working out the kinks and getting my settings back to how I like, I encountered the following problem:
Every once in a while my screen randomly flickers, goes black, and I see a message saying something about Light Display Manager in greenish text. Then I'm brought to my login screen and I login normally, everything seems fine. Then the crash happens again after maybe another 5-10 minutes.
Does anyone know what the problem is? What I should do to fix it? It's very annoying to randomly have my screen go black.