Since such control is not a sure thing and highly dependent on the PC's design, that's why your research hit a brick wall. When I needed such things I had to design the circuits or use other devices. So with this out of the way, did you want to tell more?
I have not found anything on this subject, nor have I had much success with finding a hub that I need; I'm not sure it's possible at this point.
I need the ability to programmatically turn a USB port on a hub on or off. I know there are hubs that allow you to control the voltage that a port is putting out. I also know there are USB strips that have physical I/O switches on each port. However, I need to be able to switch ports on or off from a remote location.
Any help is much appreciated, thanks in advance!