You can follow this link, but basically you do this:
- add "options thinkpad_acpi fan_control=1" without quotes to /etc/modprobe.d/options
- then you control fan speed with this commands (as root):
echo level 0 > /proc/acpi/ibm/fan (fan off)
echo level 2 > /proc/acpi/ibm/fan (low speed)
echo level 4 > /proc/acpi/ibm/fan (medium speed)
echo level 7 > /proc/acpi/ibm/fan (maximum speed)
echo level auto > /proc/acpi/ibm/fan (automatic - default)
echo level disengaged > /proc/acpi/ibm/fan (disengaged)
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