T420 Not recognizing keyboard before OS loads

The T420 my company buys will not recognize an external keyboard while docked before the OS loads.  After the OS loads, there is no problem.  We us a disk encryption software that requires a username and password before it will load the OS and each time I have to open the lid of my T420 and enter the password there.  We also have the same problem with the X220 models we get.  I've updated to the latest BIOS, is there anything in the BIOS that will enable the keyboard?

@dmarshal17,
Is it this mini dock 3?
http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/catalog.workflow:item.detail?...
//JameZ
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X240 | 8GB RAM | 512GB Samsung SSD

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