It is important that you follow these instructions as it is not a good idea to have two different ApplePS2Controller.kexts under different names. Originally the Voodoo code was packaged as ApplePS2Controller.kext as it was based on code originally from Apple. Newer versions, including this one are called VoodooPS2Controller.kext.

In addition, as of version 1.7.4, AppleACPIPS2Nub.kext is integrated into VoodooPS2Controller.kext, and you must remove it.

So here is the instructions:

• remove /S/L/E/AppleACPIPS2Nub.kext (sudo rm -rf /System/Library/Extensions/AppleACPIPS2Nub.kext) (note: this is only for version 1.7.4 or greater)
• remove /S/L/E/ApplePS2Controller.kext (sudo rm -rf /System/Library/Extensions/ApplePS2Controller.kext) install VoodooPS2Controller.kext using your favorite Kext installer (Kext Wizard) (note: for versions prior to 1.7.4, you must install AppleACPIPS2Nub.kext as well)
• optional: rebuild permissions and kernel cache
• reboot