ACPITZ(4)

NAME
acpitz - ACPI Thermal Zone

SYNOPSIS
acpitz* at acpi?

DESCRIPTION
The acpitz driver supports ACPI Thermal Zones.

The temperature can be monitored by the envsys(4) API or the envstat(8) command.

EVENTS
The acpitz driver knows about the active cooling levels, the current temperatures, and critical, hot, and passive temperature thresholds (as supported by the hardware). The driver is able to send events to powerd(8) when the sensor's state has changed. When a Thermal Zone is critical, a critical-over event will be sent or if the Thermal Zone is hot, a warning-over event will be sent to the /etc/powerd/scripts/sensor_temperature script.

The critical temperature is the threshold for system shutdown. Depending on the hardware, the mainboard will take down the system instantly and no event will have a chance to be sent. The passive temperature is the passive cooling temperature threshold. Passive cooling means the Thermal Zone hardware doesn't have any software control. On capable hardware, active cooling can power on and off fans, for example.

SEE ALSO
acpi(4), envsys(4), envstat(8), powerd(8)

HISTORY
The acpitz driver appeared in NetBSD 2.0.

BUGS
Any policy control such as fan control is not implemented.