zcfan - Man Page
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:
- The temperature is now at least 10C below the trip point, and
- 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
Author
Chris Down chris@chrisdown.name
Reporting Bugs
Please send bug reports to https://github.com/cdown/zcfan/issues.