I am using xubuntu and I upgraded from 13.10 to 14.04 today.
Now, when I close my laptop and I reopen it it show the login screen (as normal). When I enter my credentials, it show a black screen. I must to push the start button of my computer to show the login screen again and reenter my credentials.
I see my desktop but I think it restart the session. All my applications are close.
When I put my laptop in standby with the menu, it works perfectly.
Is there a solution?