I work with a Thinkpad X220 and have Xubuntu 11.10 installed. Everything works fine, except for this;
When I suspend my laptop, while it is connected to my external monitor (either cloned screen or only using the external monitor), it gives a blank screen when coming out of suspend. I can still see my mouse moving, but both screens remain blank.
Only a hard reset fixes the issue. Returning it to suspend (by closing laptop) does nothing. Both screens remain inactive (black, but with mouse pointer) after wakeup from suspend/sleep.
Some further information;
A) I have memorized the "Display settings" command. When I press the command sequence on my keyboard to 1) show only laptop screen and then 2) show only the external screen, my display (on the external monitor) returns and I can proceed as normal. But I have to do this every time, and when I make one mistake I am lost (as I cannot see the output unless I do it completely right).
B) I have now installed the gui interface "grandr" and edited to e.g. show only my external monitor or a dual screen setup (depending on my preferences). Now, when I put my laptop to sleep/suspend, both displays work normally (dual or only single external display) after resuming from sleep or suspend. - So I guess the is sort of a solution, but it requires you to install grandr and not to use the Xubuntu display settings menu.
Maybe someone has a better solution or fix?