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

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On Mon, Sep 6, 2010 at 4:47 PM, Arjan van de Ven <arjan@xxxxxxxxxxxxxxx> 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?

Best regards,
Tiago

> (and the next version will provide much much more detail)
>
>
>
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