Re: [Discuss] Speedstep on Celeron SU2300 - 20% more battery lifetime on Windows

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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 <arjan@xxxxxxxxxxxxxxx>
> wrote:
>>
>> ÂOn 9/6/2010 3:03 PM, Tiago Marques wrote:
>>>
>>> On Mon, Sep 6, 2010 at 4:47 PM, Arjan van de Ven<arjan@xxxxxxxxxxxxxxx>
>>> Âwrote:
>>>>
>>>> ÂOn 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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