Originally Posted by 9to5cynic
Hmm.. I haven't run 13.04 yet.. but I think I read they switched to a different... something - WM, DM, something. Mir, I think. Could be the cause?
Maybe try boot to an alternate DM and see if that helps.
Truthfully, I'm no linux guru. I know very very basic stuff about the OS. However, some google searches have led me to various possibilities for what is going on. Some suggest it could be the kernel, others say it's the GPU drivers, and another thread says it could be lightdm.
There's no pattern to how long the system stays active. It could be immediate or it could be 10 minutes. My frustration has reached the peak, so I've quit searching for answers lol, which is what ultimately lead me to this lovely thread.