U3419W, side USB, no power?

Hi,

I've just switched from a U2312HM to a U3419W. On my previous monitor, the two side USB were able to provide power to recharge, for example, an external battery or a keyboard. The side USB on my U3419W do not perform this same function. I wanted to know if (1) whether this was normal and if not (2) how to solve this? 

I also used to have a Logitech Unifier Receiver connected in one of these side USB ports but it is not working anymore with the new U3419W. 

Thank you!