How to turn on the Scroll Lock led using the command line? KGMailNotifier

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http://askubuntu.com – Using the command line, how can I turn on my Scroll Lock led? I use Ubuntu 12.04 LTS. I tried xset led named "Scroll Lock" but nothing happened. xset q says the led is on, but no light is on... I need this to configure the KGMailNotifier to turn on this led when a e-mail comes to me. Edit: setleds -D +num didn't work too... (HowTos)