How to turn off monitors for Power Saving in KDE?

Luis Maceira luis_a_maceira at
Thu Jun 23 07:45:01 BST 2011

When I connect an external monitor to my laptop running Debian Stable and KDE both monitors are turned on and I can't turn off my laptop monitor to save power.I cannot find anything in KDE GUI to enable the option for turning on/off monitors connected to the system.Do I need to edit any configuration file? I am interested in turning off monitors AND the LCD backlights being really disconnected for power saving.
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