I tried the steps at Ubuntu freezes/crash after wake when upgraded to 13.10. None of them solved my problem.
When I close the lid on my laptop, ubuntu goes to sleep just as it always has. However, since the update, it just shows a black screen (pixels emit leak through light, showing screen to at least have turned on.)
Sometimes (once), my desktop will flash before going into the black screen.
This is a very annoying bug, and if any more information is needed (cat insert-config-file-here, etc), I am willing to provide