I'm finishing up my latest install and find that my powered usb hub is feeding back 5v to my computer's usb ports. Typically this wouldn't be a problem but I'm using the 5v of the usb ports to know when the laptop is running or not.
Do all hubs do this or is mine a cheap one that the manufacturer forgot to isolate the power rail?
I tried putting a diode in the cable but the voltage drop is too great. I haven't tried a shottkey yet.