CONFIG_S3C2416_PM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C2416_PM (not configurable)

modulename: pm-s3c2416.ko

and/or

pm.ko

configname: CONFIG_S3C2416_PM

Linux Kernel Configuration
└─>S3C2416_PM
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
Internal config node to apply S3C2416 power management

source code:
arch/arm/mach-s3c2416/pm.c