[ltp] Speed stepping below 798000 Hz

[Michael Gaber]

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no windows does NOT go to 300, because the processor doesn't run on  300.

what windows does is using cpu-idle-calls to lower the effective 
frequency (like echo'ing something into 
/proc/acpi/processor/cpu/cpu0/throttling )

Dragos Vingarzan wrote:
> OK, but my T43p with a 2.13G CPU also does not go below 800Mhz. The 
> thing is that in windows it even drops to 300!!!
> I'm using 2.6.12-gentoo-r10 and here are the 
> /sys/devices/system/cpu/cpu0/cpufreq/ readings:
> 
> cartman cpufreq # cat cpuinfo_min_freq
> 800000
> cartman cpufreq # cat scaling_available_frequencies
> 2133000 1866000 1600000 1333000 1066000 800000
> 
> Anybody has any ideas on how to tweak this list? Or do you know a kernel 
> patch for it? I would really like to run it at 300 when reading emails 
> as the autonomy is really crapy compared to my good old T42...
> 
> Also I observer something... if I put in BIOS that on battery it should 
> switch to max battery life, also the list of available frequencies 
> changes on power disconnect and it locks to only 800000...
> 
> Cheers,
> Dragos
> 
> 
> André Wyrwa wrote:
> 
>> Alex Polite wrote:
>>
>>> On 10/9/05, Noah Dain <noahdain@gmail.com> wrote:
>>>
>>>> what does:
>>>> $ cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
>>>>
>>>
>>> It gives me 798000. Guess I'm out of luck :(
>>>
>>> Thanks a lot for all the info.
>>
>>
>>
>> Your processor is a PIII-M, that features Enhanced Speedstep, which 
>> only has a low and high state, nothing in between.
>>
>> See:
>>
>> http://www.thinkwiki.org/wiki/Intel_Mobile_Pentium_III-M
>>
>> http://www.thinkwiki.org/wiki/SpeedStep
>>
>> André.
> 
> 
> 
> 


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