Yes, you are right, any properly implemented USB 3.0 controller should be backwards compatible with USB 2.0. That being said, there is a slight possibility that you may have a faulty USB 3.0 controller. As mentioned before, it would be a good idea to try and see if other USB devices work on that port. That way you can narrow down the failure reason and exclude the controller if you see that other USB devices work without problems. However, without any additional information I cannot give you more suggestions, as I would prefer to give no answer than give a wrong answer.
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