Processor Throttling In Windows XP
TomSlick writes "Michael Chu, a former Intel employee, has written up a fairly interesting and readable summary of Windows XP power schemes as they relate to Intel processor throttling. An old topic, but one still relevant as many business notebooks still use XP."
Sure you can:
cpudyn - CPU dynamic frequency control for processors with scaling
cpufreqd - fully configurable daemon for dynamic frequency and voltage scaling
cpufrequtils - utilities to deal with the cpufreq Linux kernel feature
All are found in your apt repository.