I see. Thanks. It seems that intel_idle isn't supported on Core 2 based Celerons.
Best regards On Tue, Sep 7, 2010 at 12:28 AM, Arjan van de Ven <ar...@linux.intel.com>wrote: > On 9/6/2010 3:03 PM, Tiago Marques wrote: > >> On Mon, Sep 6, 2010 at 4:47 PM, Arjan van de Ven<ar...@linux.intel.com> >> wrote: >> >>> On 9/6/2010 1:35 AM, Thomas Renninger wrote: >>> >>>> Hi, >>>> >>>> I am adding lesswatts.org and linux-pm list. >>>> I expect you found out why you do not get frequency/P- states and it >>>> seem to be correct. On these lists, people can help you further >>>> to find out Linux vs Windows battery drain differences. >>>> >>>> If you have the same backlight settings, I expect C-state or graphics >>>> card must be the reason. There is nothing else than CPU or GPU >>>> that drains so much energy for being the reason of >>>> 20% more battery life time. >>>> Which graphics card and driver do you use (for nvidia/ati, trying the >>>> binary one for comparison, might show a big difference on a recent >>>> card)? >>>> Which C-state driver do you use (there is an acpi and intel_idle one >>>> with latest kernels): >>>> cat /sys/devices/system/cpu/cpuidle/current_driver >>>> I hope to be able to provide a c-state tool soon, for now you have to >>>> go through: >>>> cat /sys/devices/system/cpu/cpu*/cpuidle/state* >>>> to check which and how often/efficient C-states are used. >>>> >>> powertop will tell you exactly this >>> >>> Thank you. Please see my previous e-mail. C0, C1 and C4. Do you know >> of any way to force the intermediate ones for debugging? >> > > intel_idle driver is the only way that's reasonable in amount of work. > > for anything else you depend on the grace of the bios. > >
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