Fan Speed control on my Thinkpad T4x0

This article fall under my How to Sections and will be reported here for later brain dump restore :-D

Well, what’s about the topic? I installed and configured some performance monitoring stuff (will write a HowTo later for this one) and
realized that my fan-speed on the ThinkPad T400 was extreme slow, while thermal sensor tell me CPU temp is increasing.

I did some research and found the following to work for my Ubuntu config:

Karma w/ 2.6.31-22-generic-pae – (PAE because I used a 32-bit with 4GB RAM).
create new file ” vi /etc/modprobe.d/thinkpad_acpi.conf” and add the following line “options thinkpad_acpi fan_control=1”

Do some sort of “modprobe -r thinkpad_acpi && modprobe thinkpad_acpi” OR reboot (<– only for lamers ;-))
which enables you to perform some sort of actions with the fan:

# cat /proc/acpi/ibm/fan
status:        enabled
speed:        3416
level:        auto

commands:    level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:    enable, disable
commands:    watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))

 echo level 7 > /proc/acpi/ibm/fan
$ echo level full-speed > /proc/acpi/ibm/fan
$ echo level auto > /proc/acpi/ibm/fan

Have some Fun and as always I have tested it before post!



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