yes it can be if your using latest edp... com.apple.boot.plist
edp uses org.chameleon.Boot.plist now.
so a sv1 revision is requiered... edp should have an option to install it
that can be an irq issue in your hardware or dsdt maybe... try turning off all legacy hardware you dont use in bios like serial/paralel/modem/firewire/pcmcia/ anything like that maybe even bluetooth if so equipped.