Hi,
I'm trying to find out how to solve this annoying issue. If I plug or unplug the AC cord to my Dell Studio 1575 then the next time I boot the computer I get a black screen after log in, a few seconds after LXDE is fully operational. I'm using Lubuntu but I experimented the same issue with Xubuntu, Kubuntu and Fedora (KDE). So I guess it's a core related issue.
Every time it happens I need to close the laptop lip in order to make the computer to suspend, after that I proceed as usual when the computer gets suspend.
The black screen is a strange thing because I can see the mouse pointer and the boot process messages and the mouse pointer changes it shape when (I suppose) it's over icons and buttons. I tried to click randomly over the black screen and after it affects the opened applications and/or desktop elements.
Thank you very much in advance,
Luis Pablo