X220: external USB keyboard not detected in BIOS

Hi!
I use an external USB keyboard attached to the port replicator of my X220. When Windows is booted the keyboard works without any problems. But I cannot use the keyboard pre-boot, e.g. to enter the HDD password after starting up, to configure the BIOS, etc.
I tried all USB ports both of the port replicator and the X220. The keyboard is still not detected by the BIOS (Version 1.20) and there are no BIOS options to enable "USB keyboard support".
Has anyone experienced similar problems? Are there any solutions to get the keyboard detected by the BIOS?
Thank you for your support!

@beastiesoft and earthartja,
If I am not mistaken, we are discussing this on the T series thread. Check here.
http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T420-Not-recognizing-keyboard-before-OS-loa...
@someotherguy,
Drop you an email on this.
//JameZ
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