Same exact issue with mine tried lots of stuff no luck yet.
Are you using Win 10. We might have to go to Microsoft support for Win 10 if it is an issue with there software.Same exact issue with mine tried lots of stuff no luck yet.
I'm Working my way through the items in the device manager, I haven't seen anything like a power management tab, however, I did find this in the display adapters (Nvidia GeForce GTX260):One thing you could try. Go into the device manger and right click, and selct properties of your peripherals (Mouse: Touchpad;HD Compliant..:Keyboards..etc)
In Each open the power management tab and mark the square, "allow this device to ...etc"