linux-kernel - Thinkpad T61 - Fan running a lot of time

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Date:	Tue, 24 Mar 2009 17:44:16 -0300
From:	"Renato S. Yamane" <yamane@...mondcut.com.br>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	hmh@....eng.br, borislav@...rs.sf.net
Subject: Thinkpad T61 - Fan running a lot of time

Hi,

Anyone have seen fan turned-on in 90% of the time?

I see that fan power-on when processor is up than 45°C and power-off 
when is under 45°C.

Temperature difference between 2 cores is 5°C in idle (Core1=45°C and 
Core2=40°C)

Local temperature is ~25°C, kpowersave is in "dynamic mode", my 2 cores 
(Intel T7500) is running 94% of the time in idle (checked with "top"), 
with clock in 800MHz.

The fan speed is ~2600RPM (always under 3000RPM), and I think that is 
not enough to cooling the processor, because is necessary 3min to 
decrease 1°C in Core1 and only 40sec to increase 1°C.

I think that is necessary a higher fan speed.

I see this in Debian Lenny (2.6.26-1) and 2.6.28.8 kernel... Maybe in 
other versions too.

Regards,
Renato
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