config CPU_IDLE bool "CPU idle PM support" default ACPI help CPU idle is a generic framework for supporting software-controlled idle processor power management. It includes modular cross-platform governors that can be swapped during runtime. If you're using an ACPI-enabled platform, you should say Y here. config CPU_IDLE_GOV_LADDER bool depends on CPU_IDLE default y config CPU_IDLE_GOV_MENU bool depends on CPU_IDLE && NO_HZ default y