Comment 10 for bug 787031

On Ubuntu 16.04, I added the following line to /etc/thinkfan.conf

    hwmon /sys/devices/virtual/hwmon/hwmon0/temp1_input

Solved the issue. I can now hear myself think, and heavy usage (like compiling big source trees) makes the fan kicks in as expected. I expect this to have a very significant positive impact on my battery life!