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I want to see all powered devices. I know about powertop. But that can't recognize device that isn't truly used. For example, my networkmanager is badly configured and wifi is powered on, i don't use it, but powertop doesn't show that.

So i want to see all things that can be powered off without matter of usage.

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By 'all powered devices', I'm going to assume you mean a laptop, since any unused USB device can be unplugged. As far as I know, the only way you can query the status of your wifi directly would be to use a command like iwconfig. You can use iwconfig to turn off the wifi power, too, which you could automate via /etc/rc.local or a shortcut to toggle the state on the desktop.

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I mean something like program that knowns about all devices that can be powered off, e.g. bluetooth, wifi, ethernet adapter, discrete VGA, ... –  Miro Jan 22 '12 at 14:37

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