Considering that even Microsoft doesn't have smart cards working correctly over RDP (except for XP and WK3 Server), I don't think it's ever likely going to be working on the Linux client - at least for a while.
The solution would be to use a separate handheld token which generates a PIN instead of using a piece of hardware that must be connected to the machine.
If the smart card must be machine connected, then you will have to go to the smart card vendor for a Linux solution.
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