[all variants] power management without login

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http://ubuntuforums.org – Hi, I have been trying to understand this with google for a day now, it's time to ask. I don't fully understand how the power management works in ubuntu desktop and it's derivatives. My question is which services influence the computer when no user is logged in but the X environment is loaded? Is the loading of the X server a trigger for the power management or is it session dependent? I have considered the acpid and apmd but those only emit events and accept instructions. My computer goes to sleep automatically, and the idle timers are supposed to be controlled by gnome-power-manager or (Hardware)