Re: The fan of the laptop never stops with amd64

[Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>]

v0n0 <aledj@email.it> writes:

> Pascal Giard ha scritto:
>
>>Are you using powernowd?
>>powernowd allows dynamic cpu frequency and core voltage scaling.
>>
>>For instance, my 1800MHz (1.5V) runs at 1001MHz (1.1V) most of the time.
>>Of course, the side effect is lower power (heat) dissipation so the
>>fan(s) can slow down.
>>  
>>
> My 2GHz Athlon64 Mobile runs nearly all the time at 798MHz. But I
> noticed that if I click "Setup Helper Application" in KLaptop (so
> klaptop_acpi_helper becomes suid), my laptop uses all the power with no
> scaling (might be a profile problem?). I'm using KDE 3.4 but it was the
> same in 3.3.
> To let powernowd work again I had to manually chmod -s
> /usr/bin/klaptop_acpi_helper.
> I suggest to never enable it, because it has only 2 profiles: userspace
> (min freq), performance (max freq). So frequencies in the middle will
> never be used. Athlon64 (and Turion I think) has at least 4 operation modes.

The powernowd can be configured to different behaviour.

The default is to go straight to full speed whenever there is cpu load
>80% and then slowly drop down as long as the cpu is <20%.

I didn't find that very usefull for me. Instead I switched to SINE
mode so it slowly changes without sudden jumps. I also changed the
limits to 50% and 95% so it is more biased towads slow.

For a laptop the PASSIVE mode is probably best where it jumps to the
slowest speed whenever cpu goes <20% and only slowly rises with cpu
>80%. It will feel more sluggish to react though. Or the LEAPS mode,
what you described.

MfG
        Goswin