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The fan of the laptop never stops with amd64



I recently bought a Turion laptop with Knoppix-32bit preinstalled.
The fan used to run and stop now and then.
Now I have installed debian-amd64-testing and when the fan starts working (15sec to 30 sec after booting) then it never stops again. Furthermore, the battery lasts 30% less time approx. than with 32bit.
I am wondering why, and got 2 hypothesis:
1) Turion is dissipating a lot more power when running in 64bit mode.
2) There is something wrong with the control of the fan in debian-amd64. However, all acpi modules (thermal.ko, fan.ko, etc.) are loaded at boot time (I had to add them to /etc/modules) and they seem to be working 'cause I got battery level indication in the kde panel.
Has anyone experienced this behaviour? Is it normal?

Regards,
amm



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