Check the BIOS. Some systems have an option to control the fan from the BIOS.
That should solve the issue if it is an option.
The best solution is to avoid companies that are using these bad chipsets
though. Here is a short list of the bad chipsets: ATI & Nvidia graphics
chipsets. Go with Intel for graphics. For the wireless cards don't go with
anything other than Atheros. This is actually harder to do given more and
more vendors are locking out third party wireless cards. Definitely don't get
a Dell, Lenovo, Toshiba, or HP laptop. I can confirm these companies are
using digital restrictions.
As Cyberhawk mentioned we (ThinkPenguin.com) do sell laptops and other
freedom friendly hardware. We have the largest catalog of GNU/Linux hardware
anywhere and most of it is now available from both the UK and the United
States. Everything should work with Trisquel. Trisquel also get 25% of the
profits. Just place your order through http://libre.thinkpenguin.com/ we also
sponsor other projects and percentage of our sales from elsewhere go to the
free software foundation.