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I'm using Xubuntu 12.04, my Fn keys work, but when I press them system/apps react to the function keys bindings too e.g. if I press Fn+F11 to lower the volume my browser goes full screen... can I change this behaviour in any way?
system reacts to that binding i.e. in this case the browser goes full screen. The problem is that adding FN key does not block other keyboard bindings...
F11
xev
and see what happens when you press Fn-F11 and Fn.