KEXT=/System/Library/Extensions/VoodooHDA.kext

while true; do
	kextunload ${KEXT}
	if [ $? -ne 0 ]
	then
		break
	fi
	sleep 1
done;

while true; do
	kextload ${KEXT}
	if [ $? -eq 0 ]
	then
		break
	fi;
	sleep 1
done;