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I was wondering if the ethernet NIC draws any power at all when using Wifi? If it does, since I rarely use it, so is there a way to completely turn off the power from the device? I know some devices can be powered off by writing into some variable in the /sys folder. My guess is that unloading the driver module is not enough.

I'm running Fedora 16 with a 3.3 series kernel.

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Powertop can show you how much power various components of your system use. Whether you're using Wifi or not won't influence the power consumption of your wired NIC. A wired NIC consumes a lot less than Wifi (radio is energyvore), but I don't have hard figures. –  Gilles May 7 '12 at 23:08
    
(Intel's) LessWatts.org also contains some tips and tricks for powersaving (including Ethernet and WiFi). (I guess it's less useful than Powertop, though) –  sr_ May 8 '12 at 14:35
    
You can use ethtool to turn off wake-on-lan for your wired adapter, using ethtool -s eth0 wol d. Doing so will lower the power consumption marginally when your laptop is sleeping, but the difference will be (imo) be negligible. –  Cedric Aug 11 '12 at 20:34

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