Support for some Apple G5s

modulename: pmac64-cpufreq.ko

configname: CONFIG_CPU_FREQ_PMAC64

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Frequency scaling
└─>Support for some Apple G5s
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
This adds support for frequency switching on Apple iMac G5,
and some of the more recent desktop G5 machines as well.

source code:
drivers/cpufreq/pmac64-cpufreq.c