I have seen many reports in this issue (rather old) and I want to ask if there is a solution.
When I leave my laptop closed, even if I set all options (at least all I found) as never to set sleep mode, as I open it I see a blanck screen (with the mouse pointer visible). It is not possible to login or anything. I generally do cntrl alt F1 and restart, but it is a real pain in the ass... I read it comes from problems from the gnome version in Ubuntu 12.04.
Did anybody find a solution for it?
Thank you for your help, and sorry if I duplicate the issue...