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zcfan(1) General Commands Manual zcfan(1)

NAME

zcfan - zero-configuration fan control daemon for ThinkPads

DESCRIPTION

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

OPTIONS

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

CONFIGURATION

USAGE

zcfan has the following default fan states:

Config name thinkpad_acpi fan level Default trip temperature (C)
max_temp 7 90
med_temp 4 80
low_temp 1 70

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.

HYSTERESIS

We will only reduce the fan level again once:

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

This avoids unnecessary fluctuations in fan speed.

WATCHDOG

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

DEPENDENCIES

thinkpad-acpi must be loaded with fan_control=1.

SEE ALSO

thinkfan(1)

AUTHOR

Chris Down chris@chrisdown.name

REPORTING BUGS

Please send bug reports to https://github.com/cdown/zcfan/issues.