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
NetBSD2.0.
BUGS
Any policy control such as fan control is not implemented.