Thread: CPU frequency scaling not working

[long story] hello. had been disappointed battery life netbook had gotten under ubuntu, , switched meego, , happy , using ubuntu things ubuntu do. however, recent news meego's end thought i'd try out lighter debian distro (#!) , found burns hotter , shorter meego also. began quest in testing energy consumption in number of different oses. found debian based distros used same amount of energy (ubuntu unity more,but 1 drop when killed wifi), puppy little less, still quite bit more meego. android-x86 same debian distros, , windows 7 starter ed. used 30% less energy when idle of them! (except meego, same win7... makes sense since lowest cpu setting 30% of max cpu level) surprised me![/long story]

[crux] realized these distros not throttling cpu properly. while working , terminal reads things like: "current policy: frequency should within 1000 mhz , 1.67 ghz.
governor "ondemand" may decide speed use
within range.
current cpu frequency 1000 mhz.
cpufreq stats: 1.67 ghz:26.87%, 1.33 ghz:2.28%, 1000 mhz:70.85% (14321)"
, when altered reads correctly changes "performance" etc. , found there 0 change in energy usage despite changes made governor , frequency. have standard atom n450 processor, i'd imagine lot of people should have problem, searching on web found lot of people content terminal read-out verification working. , many others complaining ubuntu eats battery far faster windows, no explanation why.[/crux]

[question(s)] bug? or has else tested setup verify working, , found them? there necessary that's strangely absent in debian distros (or linux distros in general)?[question(s)]

there kernel bug concerning power management detected phoronix , others. start read through

http://www.phoronix.com/scan.php?pag...638_aspm&num=1
http://www.phoronix.com/scan.php?pag...item&px=otg2mg
http://phoronix.com/forums/showthrea...her-regression
http://www.phoronix.com/scan.php?pag...le_uffda&num=1

there several kernel options available can reduce power consumption, usb auto suspend, pci power management , graphics card power management.
of these options depend on chipset using. using proprietary nvidia or amd drivers may reduce power consumption since power management better in graphics drivers.

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