CPU temperature Thinkpad R61

Fri Oct 16 10:27:30 UTC 2009

Am Freitag, den 16.10.2009, 07:18 -0300 schrieb Fernando Cassia:
> 2009/10/16 Christoph Höger <choeger at cs.tu-berlin.de>:
> > Am Donnerstag, den 15.10.2009, 17:34 -0500 schrieb Mikkel:
> >> Christoph Höger wrote:
> >> > Hi,
> >> >
> >> > I just wondered why my fan always runs after a while. After closing
> >> > firefox (which took 50% cpu along with X) I now have a load of roughly
> >> > 0.06 - barely nothing computed at all. Both cores are in the lowest
> >> > config and yet my cpu temperature goes from 42Â°C to 47Â°C in roughly 2
> >> > minutes (and back by fan activity).
> >> >
> >> > I would understand this if there was some load, but what causes my CPU
> >> > to heat if it does nothing? Design failure? Has anybody seen such a
> >> > thing?
> >> >
> >> > regards
> >> >
> >> > Christoph
> >> >
> >> When was the last time you cleaned the dust out? Also are the air
> >> vents on the laptop clear when in use?
> >
> > I am aware of that dust thing (I am going to give a compressor a try),
> > but the heat goes up when the notebook and the fan is idle. That should
> > not have anything to do with dust, right?
> 
> When computers are idle (but active, I mean NOT hibernating or
> suspended) it doesn´t mean the CPU fan stops completely. Sometimes
> those spin at very low rpm so you don´t "hear" it, but the fan IS
> spinning, albeit at very slow speed.

My fan-o-meter tells me it's at 0 RPM - that's what I'd call idling. 

Strange thing is: I think the controller of that fan is in "learning
mode". In the early days, it used to prevent 50°+ at all cost, now it
even sometimes does not run at 53°. Is that some kind of ageing? 
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