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I am using gedit for some editing and when I use F9 in order to make side pane visible or invisible my display is just getting dim and nothing happens.

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I had the same problem using f9 for toggling status notifications. Perhaps we should change the title to "F9 is dimming screen" or something to make this more generic so that others will find this? – Programster Feb 5 '14 at 10:52
up vote 3 down vote accepted

You have widget layer turned on and mapped to F9 in Compiz Config

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I'm guessing that your keyboard has the brightness adjustment bound to Fn-F9. Are you sure your Fn key is not stuck? Maybe your keyboard has a Fn-Lock mode, similar to Num-Lock, and you enabled it by accident?

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