E420S fan running too long

Hello

I have a question about my Thinkpad Edge E420S (4401-29U; BIOS version 1.36).

The problem is: once the fan turns on, it stays on for an unnecessarily long time, even with low cpu load. (A similar problem is described here.)

The system is idling around 45-50 ° C. Once it hits around 55-60 ° C or more, fan comes into action and quickly lowers temperature back to 45-50... and then the fan remains on for 20-30 minutes.

My first guess is that it is a BIOS problem, because:

* the problem seems to be not high temperatures, but rather the fan who does not turn off the power as soon as the set temperature is reached.

* I was not able to control the fan through the operating system, Windows 7 (using programs such as tpfancontrol) or Debian Linux (using the thinkpad-acpi kernel module).

However, many critics of the e420s mentions silent operation, so maybe I'm wrong...

Am I right in thinking that sounds like a BIOS problem, or maybe a hardware problem? Anyone here know if it is a complaint often and if so, if there is a new BIOS update in the pipeline?

Thanks a lot for your help.

Hi djunkmayl,

You are already on the latest version of the BIOS and there is no direct definition for on BIOS CPU fan speed. But if you have installed Power Manager, then you can try "Cooling system policy" in the field "advance settings". If the problem persists, please contact local lenovo to test hardware.

Fred

Tags: ThinkPad Notebooks

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