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How can I control screen brightness while not logged in? (F16 / gnome3)

Hi People,

I have tried the FN+<specific key="" to="" control="" brightness=""> on multiple laptops to control the screen brightness while I am not logged in or a gnome session is locked (Lock Screen), but I had no success. Those keys are inactive.

Does anyone know how to make that work? Or is it something which is not implemented in GDM (Gnome3) yet?

Thanks for your input.