>>616
5-current & 4-stable のリリースノートに
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A bug that even when no AT keyboard is connected, atkbd(4) registers
an AT keyboard during console initialization has been
fixed. kbdcontrol -k /dev/kbd1 is no longer needed when only a USB
keyboard is connected.
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と書いてあるんで、5.2-RELEASEや4.9-RELEASEではなおってると思われ。