kompile a new kernel without APM support, should fix the problem.
by the way, if you remove power managment you wil not be able to shut your computer of completly without, manually, "pulling the plug".
it is APM or acpi that lets the OS shut things of automaticy.
on some systems you can just hold powerbutton presses for 3 - 10s, when the powerof line shows up on screen, to shut down.