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hwinfo --framebuffer
About your logout problem, fluxbox probably doesn't shut down properly because of something that is blocking it. This is not the default behaviour in a fresh system which works fine. You should start by trying to identify what that is and then forcing it to stop when logging out.
You seem to have mixed problems. You're saying that it wasn't working properly with slim before, but at least it was working partially. Now it doesn't work at all. Neither is acceptable and has been the result of something you did. Nobody else could have any idea what that was though...