Comment 19 for bug 823219

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Ming Lei (tom-leiming) wrote : Re: [Bug 823219] Re: USB autosuspend not working on Asus eeePC resulting in +30% powerconsumption

Except for your E620 USB Modem, all other usb devices(usb hub, uvc camera)
in your machine have been enabled runtime suspend at default.

So it should be your modem which caused the extra power consumption.