Is it possible to power up ports on a USB hub from Ubuntu?

Posted by James Henstridge on Ask Ubuntu See other posts from Ask Ubuntu or by James Henstridge
Published on 2012-06-11T03:04:29Z Indexed on 2012/06/11 4:46 UTC
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12.04

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usb

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Hardware

I have a D-Link DUB-H7 powered USB 2.0 hub connected to my computer. Occasionally when I reboot the system, I've noticed that some of the ports on the hub get powered down: the green light next to the port is turned off, and the device attached to that port is not visible to lsusb or similar commands. Devices attached to the other ports on the hub function as normal.

I am able to restore the ports by disconnecting power to the hub temporarily (from the computer, AC adapter and any devices that might provide any power such as my phone), but this is a bit of a hassle.

It seems like something that might be related to power management, so is there some way you can tell the USB hub to power up through software?

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