<pre class="alt2" dir="ltr">sudo kextunload /System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCKeyboard.kext/

<pre class="alt2" dir="ltr">sudo kextload /System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCKeyboard.kext/

props to http://forums.macrumors.com/showthread.php?t=433407