NAME

acerhdf — Acer Aspire One fan control

DESCRIPTION

The acerhdf driver allows you to control the fans of some of the Acer Aspire One netbook models, so that they are not constantly running. Other netbooks might be supported as well. See SUPPORTED DEVICES for more details. It is a port of the Linux kernel module with the same name.

acerhdf monitors the system temperature and turns the fan on if it is above the fan-on threshold, and turns it off again if the temperature drops below the fan-off threshold.

SYSCTL VARIABLES

dev.acerhdf.0.enabled

Set to 1 if acerhdf should start controlling the fan. Defaults to 0, which means acerhdf is not in control of the fan.

dev.acerhdf.0.fanon

The temperature at which the fan should be turned on. Defaults to 60.

dev.acerhdf.0.fanoff

The temperature at which the fan should be turned off again. Defaults to 53.

dev.acerhdf.0.fanstate

Read-only. Returns the current fan state, auto if the fan is running or off.

dev.acerhdf.0.interval

Seconds to wait between temperature polls. Defaults to 5 seconds.

dev.acerhdf.0.temperature

Read-only. The current system temperature in degree Celsius.

SUPPORTED DEVICES

acerhdf was tested on an Acer Aspire One A150 running FreeBSD 12.0 only. The FreeBSD port will most likely support the same range of devices as the original Linux version. This is entirely untested however.

EXAMPLES

To enable acerhdf make sure it is installed in /boot/modules and add the following settings to your /boot/loader.conf:

acerhdf_load="YES"

and your /etc/sysctl.conf:

dev.acerhdf.0.enabled=1

You may want to adjust the fan-on and fan-off thresholds as well.

BUGS

The system needs to have a hard drive installed, otherwise acerhdf will not work correctly and the system will automatically power down after some time. This behavior is enforced by the BIOS and there is no known workaround. This bug is present in the Linux version as well.

SEE ALSO

kenv(1), loader.conf(5), sysctl.conf(5)

AUTHORS

acerhdf was ported from Linux to FreeBSD by Tobias Kortkamp <t@tobik.me>.

The original Linux version of this module was written by: Peter Feuerer <peter@pie.net> and Borislav Petkov <bp@alien8.de>.