After 10 minutes my desktop computer darkens the screen, and when I move the mouse or tab any key it comes back alive and asks for my password. That is perfect and the behavior I like to have it.
But sometimes (mostly after a longer period) I can't get back to the login screen.
Nothing happens when moving mouse or press a key. Only way to get the computer back working is by restarting with reset button on the machine.
Has anyone an idea what I need to do?
I have a AMD HD 7950 grapics card with the 13.12 driver.
Ubuntu is 13.10 with Unity.
Here is a link to a blogger with the same problem: