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If the speed reported isthen is typically due to a broken fan assembly.
TPFC - Thinkpads Forum
Later ThinkPad models seem to take at least 5s to start responding to a fan mode change, for example. It is written for Linux only. Exiting it is much faster. In disengaged mode, the embedded controller does not monitor the fan speed.
The A31 acts differently, and switches to disengaged mode as fast as thhinkpad switches to other modes. The following description may be inaccurate and may vary by model see list of models above. The end speed is not stable, but it is often much faster than the maximum speed manual and automatic modes would set the fan to. Packages are available for debian based linux systems.
This page was last modified on 28 Octoberat In manual mode, the fan level is forced to the given value and the EC will auto-regulate the fan to maintain at a roughly constant RPM, which is model-dependent. You must also enable manual control for your thinkpac.
I wrote this for my own personal use, and thought that it would be a good idea to release it to the world, and hope that it will be useful to someone!
In automatic mode, the embedded controller sets the fan speed automatically according to system temperatures and some unknown algorithm. Later T models such as the T43 have this problem, while the A31 does not.
Most newer ThinkPads take quite a while in excess of one minute to fully enter disengaged mode. Contents 1 For Linux 1. When designing fan-control applets, never ignore a valid thermal sensor. It monitors the laptop's thermal sensors and sets the fan speed accordingly, according to customizable thresholds.
Feel free to send comments, bug reports or a thanks to the e-mail above. You are required to have the Linux kernel with 'thinkpad-acpi' patch. If a battery pack seems to want the fan to always run faster, the only safe thing to do is to make it run faster.
For example, in Debian Lenny and Ubuntu 8. An ACPI fan control script can be used to override the firmware's fan algorithm with gentler, quieter version. Apparently the pulsing fan noise experienced by some users can be cured by repeatedly running seconds of manual control followed by 0. This page discusses methods for controlling the system fan.
How to control fan speed - ThinkWiki
Some of the ACPI fan control scripts implements this solution. Always play it safe. Once it arrives at maximum speed, or once it gets back at closed-loop cruise speed, the embedded controller starts updating the tachometer registers again. Shimodax's ThinkPad fan control tool offers similar functionality see forum discussion at thinkpads. No need for patching. There is an distro independent daemon http: