This post is also available on/was written for OMG! Ubuntu
This blog post isn’t only directed to ThinkPad owners as most notebook Linux users with Intel Core Duo 1/2 and i3/i5/i7 processors have been affected by this bug if not all. And yes, this problem is present on latest Debian Unstable and Ubuntu 11.10.
I’m owner of Thinkpad X300, great machine except the fact that just recently I replaced its 3rd cooling fan! Yea, I do a lot of compiling and it’s on all the time, but still this kind of things shouldn’t happen. I first linked this problem to the fact that Thinkpad fan on Linux (as of 2.6.22) always works at what’s its basically maximum RPM, thus the reason there are numerous fan control scripts. My favorite one is Thinkfan, but controlling fan doesn’t really help if you have a overheating problem. For matter of a fact it working on its maximum speed might only help, with its own toll.
As of kernel 2.6.38 up until 3.1 (still present) there has been a problem of power regression but besides this I had slight problem with overheating. Regarding overheating in beginning I tried reporting bugs, tried different Thinkfan configurations, blamed proprietary software such as Adobe Flash for spiking up CPU temperature, however this problem was somewhat solved. After numerous battery calibrations and as these didn’t work in the end for battery life getting poorer with each day, I just blamed the factor that notebook was getting pretty old (~3 years).