CPU idle PM support

modulename: cpuidle.ko
configname: CONFIG_CPU_IDLE

Linux Kernel Configuration
└─> Power management and ACPI options
└─> CPU Idle
└─> CPU idle PM support

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.

source code: