This patch works against kernel 2.6.5 as it did for 2.6.3. If you try 
and turn APIC off in settings then the kernel will crash at compile 
because of his C1halt function. I'm not sure how to fix that. I forgot 
to record the compile error as well. To use it you need to send 
idle=C1patch to the kernel at boot and their needs to be a way so that 
you can instead select this from the config menu and toggle it on and 
off with the APIC controls.

Richard James :)