Modløsheden melder sig

Jeg har i sidste uge modtaget et nyt uddannelseskort – på trods af jeg ikke har bestilt det. Der er oprettet en betalingsaftale, så de trækker beløbet direkte – uden godkendelse.

Jeg har ingen forelæsninger i december måned, så jeg havde egentlig ikke nogen planer om at bestille et kort.

Efter sidste omgang har jeg simpelhen ikke mod på at prøve at få refunderet beløbet.

Thinkfan on a Lenovo T420

Warning: tampering with the fan control on you laptop is potentially dangerous, and I will not take any responsibility if anything happens to your machine. With that being said; I have used Thinkfan for various Thinkpads (7 I think) with no problems at all. Just be warned.

A lovely Lenovo T420 has recently dropped into my possession – not the worst thing that can happen. Well, actually it is a company laptop – but enough with the chit-chat.

Linux support on this machine is far from perfect, but one of the most annoying things about it, is the fan noise. It is constantly on at ~3500rpm and very noticeable (read: annoying).

First, install Thinkfan. (I owe my sanity to these developers!)

$ sudo aptitude install thinkfan

To enable fan control, the kernel acpi module must be enabled with explicit support.

$ sudo su -c "echo \"options thinkpad_acpi fan_control=1\" > /etc/modprobe.d/thinkfan.conf"

And reload the module.

$ sudo modprobe -rv thinkpad_acpi && sudo modprobe -v thinkpad_acpi

We also need the coretemp module, which is not autoloaded.

$ sudo modprobe -v coretemp

To make it autoload, append it to /etc/modules.

sudo su -c "echo \"coretemp\" >> /etc/modules"

Now, edit /etc/default/thinkfan to enable the thinkfan service to start. There are a lot of precautions here 😐

START=yes

Then, the following to /etc/thinkfan.conf, just after the comments – before the threshold declarations.

sensor /sys/devices/platform/coretemp.0/temp1_input
sensor /sys/devices/platform/coretemp.0/temp2_input
sensor /sys/devices/virtual/hwmon/hwmon0/temp1_input

Finally, start Thinkfan.

sudo /etc/init.d/thinkfan start

And.. Enjoy the silence :-)

Heads up for the people who led me to the solution:
[1] http://ubuntuforums.org/showthread.php?t=1749186#9
[2] http://thinkpad-wiki.org/Thinkfan