Every time I logoff from Ubuntu 12.04 I get a black screen. If I logon again as if I could really see what I'm doing, the screen returns to normal. This doesn't happen with other two users on the same machine, with both of them I can logoff withouth problems. Any clues?
This is what I have done on my laptop. I have a integrated Intel GPU.
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There are some possible fixes about ATI and nVidia.