Talk:Power management/HOWTO

Deprecation Warnings
"Warning package sys-power/cpufreqd is deprecated and has been removed from the portage tree". It is always courteous and best to also advise the reader what is now being used as a replacement for cpufreqd! Else, people spend more time finding such trivial information. --Roger (talk) 00:11, 14 January 2015 (UTC)


 * Theodore Ts'o wrote his explanation on Google+:
 * * intel_pstate can be disabled at boot-time with kernel arg intel_pstate=disable
 * * The problem with the ondemand governor is that it doesn't know the specific capabilities of the CPU
 * * Executing some tasks with higher frequency will consume less power than would a lower frequency taking more time e.g. arithmetic stuff, but not true for all tasks e.g. loading something from memory
 * * The intel_pstate driver knows the details of the how the CPU works and it does a better job than the generic ACPI solution
 * * intel_pstate offers only two governors, powersave and performance. Intel claims that the intel_pstate "powersave" is faster than the generic acpi governor with "performance"


 * The above should be somehow included within the article to accurately describe the default policy for Intel Sandy Bridge and Ivy Bridge CPUs as of kernel 3.9. --Roger (talk) 00:11, 14 January 2015 (UTC)