[ubuntu] How to suspend network interface r8169

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http://ubuntuforums.org – Hi everyone, im using a Toshiba Satellite M645 with powertop to save energy, when i'm using the wireless network the eth0 network interface (wired) is on too and I see it consumes 9 Watts according to Powertop. How can I turn off the NIC or what can I do to save energy and decrease the discharge rate of the battery? Thanx I'm using Ubuntu 12.04 and here is my screen capture Attached Images Captura de pantalla de 2012-07-09 19:56:24.jpg (118.0 KB) (Hardware)