I've been searching and messing around with powertop, tlp, and general power settings for a few days now and just can't seem to get rid of this ridiculous power drainage from a usb device. (Color sensor by Pantone - aka "X-Rite")
All tunables are set to 'Good'.
My laptop is a ThinkPad W541 and I am running Ubuntu 16.04
Any help/tips would be greatly appreciated for power saving even if unrelated from the usb device, but the usb is my main concern.