Playing a little with the visual effects settings, I've founde that this only happens when visual effects are enabled. With visual effects enabled, unchecking "General Options -> Display Settings -> Detect Outputs" in "Advanced Desktop Effects Settings" solves the problem.
Playing a little with the visual effects settings, I've founde that this only happens when visual effects are enabled. With visual effects enabled, unchecking "General Options -> Display Settings -> Detect Outputs" in "Advanced Desktop Effects Settings" solves the problem.
This two bugs refer to the same problem: /bugs.launchpad .net/ubuntu/ +source/ compiz/ +bug/130933 /bugs.launchpad .net/ubuntu/ +source/ compiz/ +bug/137818
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