If you're having ACPI or CPU scaling issues on the Toshiba Satellite M305D-S4830 laptop or similar, you probably need a DSDT override.
I thought I'd share the override I've created so anyone who is having the same issues won't have to go though the hell of debugging their description tables.
So, here goes...
EDIT: Actually, this might not be needed anymore. Simply adding acpi_osi="Linux" to the boot parameters seems to have done away with the ACPI issues..