Windows 7 usb power management turning usb port off

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If you ask your own question - our Certified Experts will team up with you to help you get the answers you need. To save power, Windows automatically shuts down the power to USB ports. It surely saves power, but what if it is causing you problems with your auxiliary devices or if you simply need a USB device that is always powered? The Device Manager window will open.

Turn off the Allow the computer to turn off this device to save power by unchecking the box then click the OK button:. If you experience lost USB connections or power from a USB port to your auxiliary device, try the steps above then idle the device and wait for a few minutes to confirm that the problem has gone away.

Founder of Help Desk Geek and managing editor. Remove From My Forums. Asked by:. Archived Forums. Visual C. Sign in to vote. Hi, I am trying to write some code that will power down a USB port and then power it back up again.

I have a USB modem which some times locks up in the firmware and won't respond until it has been power cycled. The modem is attached to a remote device so it would be better if some software could restart the modem instead of having to send some one out to restart it.

So far I have been trying to open the usb hub and set the port power feature off and then on again. The code I have been using so far is as follows.