Sorry for the delay in my response. I've only just found the time to
try your suggestion and reply.

On Mon, Jul 25, 2016 at 10:47:36PM +0200, Ludovic Courtès wrote:
> Could you try writing the following in /run/modprobe.d/fan.conf:
> 
> --8<---------------cut here---------------start------------->8---
> options thinkpad_acpi fan_control=1
> --8<---------------cut here---------------end--------------->8---
> 
> and then rebooting?
> 
> If everything goes well, this .conf file will be taken into account when
> udev asks to load ‘thinkpad_acpi’.

I can confirm that this worked fine. Thanks!


> Eventually we should provide a way to specify /run/modprobe.d entries
> via the ‘operating-system’ config, though.

Sounds good. As someone who comes from a background in configuration
management, I would much rather have the entire system configuration
defined in a state configuration file than do manual once-off edits
(which is a part of what has attracted me to the project).

Now I just need to figure out how to set /proc entries on boot. I
guess I need to write a "service" for that, although I'm currently a
complete a noob at Scheme. Actually, that's why I purchased this X60
100% free software-compatible laptop - so I could better experiment
and learn these technologies.

Ultimately there are a number of programs I use under Debian which I
would like to create Guix packages for when I'm more comfortable with
how it all works. Then it's just a matter of finding the time to read
and experiment. :)

Cheers,
Adam