Man page - zcfan(1)

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Package: zcfan
apt-get install zcfan

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zcfan - zero-configuration fan control daemon for ThinkPads

zcfan is a minimal, zero-configuration fan control daemon for ThinkPads.

zcfan does not take any options. If any are provided, a help message will be printed and zcfan will exit.

zcfan has the following default fan states:

Image grohtml-723876-1.png

You can optionally override this configuration at /etc/zcfan.conf with your desired threshold values in the following format:

max_temp 85
med_temp 70
low_temp 55

If no trip temperature is reached, the fan will be turned off.

We will only reduce the fan level again once:

	1.		The temperature is now at least temp_hysteresis Celsius below the trip point (default 10C), and
	2.		At least 3 seconds have elapsed since the initial trip.

This avoids unnecessary fluctuations in fan speed.

The kernel watchdog is reset every 120 seconds by default, but a smaller value can be selected in the /etc/zcfan.conf config file with the syntax

watchdog_secs 10

thinkpad-acpi must be loaded with fan_control=1.