E540: Fan does not stop

Hello Board and support team!

The fan in my e540 does not stop once it began to turn. It is completely independent of the system temperature. Even if the room temperature and the cpu is less than 40 * C the fan will not stop.

The fan does not always turn, however. If I wake up the system from sleep mode or turn it on, the fan does not turn and will not start spinning until a certain threshold temperature is reached. This part of the fan control works correctly.

Interesting procedure: I work until the heating system and the fan starts. I waint until the system is cooled below 40 * C (checked with software speccy, the flow of air leaving the laptop is cold). The fan is still running at this stage and will turn probably forever. I suspend the laptop (no full stop not required). I immediatally 'wake up' the laptop (temperature of the system has not changed, no time to cool). The fan is off again and will not start turning until the temperature threshold is reached.

What can I do to fix this? I don't always want to suspend my laptop to turn off the fan. She has to stop on its own.


Tags: ThinkPad Notebooks

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