[indiana-discuss] [pm-discuss] b111a: Power Management and nwam-issue ?

[Mark Haywood]

Antonello Cruz wrote:
> Mark Haywood wrote:
>> Antonello Cruz wrote:
>>> Aubrey Li wrote:
>>>> On Tue, Apr 28, 2009 at 3:05 AM, Henrik Johansson 
>>>> <henrikj at henkis.net> wrote:
>>>>>
>>>>> My power management works fine when I first boot my Lenovo T61, 
>>>>> but after
>>>>> putting it into suspend mode it will always run on the highest 
>>>>> frequency.
>>> I see the same behavior with a Dell XPS 1330M
>>> I've notice that if I disconnect the power adapter and then 
>>> reconnect, it goes to a more same behavior.
>> So that I can do some investigation ... I assume you are running 
>> CPUPM in poll-mode?
> That's right, I've attached my power.conf file
>
>
> Since I cannot type (apparently) here is what happens:
> If I suspend/resume, after resume powertop report max P-state 
> (2001Mhz(turbo) 100%) and it seems the system is stuck at that cpu 
> frequency. This is confirmed with
>    kstat -m cpu_info -s current_clock_Hz
>
> If I unplug the power supply, the cpu frequency drops to 800MHz. When 
> I plug the power supply back in, the frequency goes up to 2001Mhz and 
> gradually goes down to 800MHz again. Frequencies in all steps are 
> confirmed with
>     kstat -m cpu_info -s current_clock_Hz

Folks really ought to use powertop instead of the current_clock_Hz kstat 
now. Unfortunately, I think current_clock_Hz will be a confusing kstat 
now that PAD has integrated. You might still see that you are not 
leaving the 2001MHz P-state, but I would verify with /usr/bin/powertop.

Thanks,
Mark

>
>
> Antonello
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