USB 2 hub only works on USB 3.0 ports

I have a USB 2.0 hub manufactured by Plugable (part number USB2-HUB-AG7) that I am trying to use with my
HP DV6t-6b00 laptop.  The hub and all devices works normally with the USB 3.0 ports but does't work at all with the USB 2.0 ports.  This behavior happens even when no devices are plugged into the hub.  The hub also works normally in other my other computers (a HP 6910 laptop and a Dell desktop).  
Has anyone seen this occur before? I would like to use the the hub but don't want to lose a USB 3 port to plug in a USB 2 hub.  

I understand that USB devices do not work in the USB 2.0 ports.
What happens when USB devices are used in the 2.0 ports?  Does Windows behave as if it has detected them or does it give an error message?
Do devices work in the 2.0 ports without going through the USB hub?
Is the HUB working off USB  power or does it have a dedicated power adapter?
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    Message was edited by: blick
    Message was edited by: blick
    Message was edited by: blick

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