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POWERD(8) NetBSD System Manager's Manual POWERD(8)
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by Kimmo Suominen.
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powerd -- power management daemon for sysmon
powerd acts upon power management events posted by the kernel's power
management facility. When events are posted, powerd translates the event
into a script name and a list of arguments. powerd then runs the script
in order to implement the power management policy defined by the system
powerd supports the following option:
-d Enable debugging mode. Verbose messages will be sent to stderr and
powerd will stay in the foreground of the controlling terminal.
All of powerd configuration is encapsulated into scripts that are run
when power management events occur. powerd will look for these scripts
in two locations. The first location is
/etc/powerd/scripts/<power_type>, where <power_type> is defined by the
power management mechanism supported by the system, e.g., ``apm'' or
``acpi''. If the script is not found in the first location, powerd looks
Configuration scripts are run synchronously, i.e., powerd will start the
script and wait for its completion before it handles the next event.
Configuration scripts are called with different arguments, depending on
the script class. These classes are described in the following sections.
POWER SWITCH SCRIPTS
Power switch scripts are called when a state change event occurs on a
power switch device. Power switch scripts are called with two arguments:
the device with which the device is associated, and the event type.
The following power switch script names are defined:
power_button This script is called when an event occurs on a power but-
reset_button This script is called when an event occurs on a reset but-
sleep_button This script is called when an event occurs on a sleep but-
lid_switch This script is called when an event occurs on a lid switch
acadapter This script is called when an online or offline event
occurs on an AC adapter device.
This script is called when an event occurs on a hotkey but-
The following events are defined for power switch devices:
pressed The button was pressed, the lid closed, or the AC adapter con-
released The button was released, the lid opened, or the AC adapter dis-
connected. Note that power and sleep button devices usually do
not post this type of event.
The following is an example of how a power button script might be invoked
when a power button is pressed by the operator:
/etc/powerd/scripts/power_button acpi0 pressed
envsys(4) scripts are called when a condition was triggered in a sensor.
These scripts are called with three arguments: the device associated, the
event type and sensor's name. The sensor_drive and the sensor_battery
scripts uses a fourth argument: state description.
The following envsys script names are defined:
sensor_battery This script is called when an event occurs on a bat-
tery sensor (Wh/Ah/Battery state).
sensor_drive This script is called when an event occurs on a drive
sensor_fan This script is called when an event occurs on a fan
sensor_indicator This script is called when an event ocurrs on a indi-
sensor_power This script is called when an event occurs on a power
sensor_resistance This script is called when an event occurs on a
resistance sensor (Ohm).
sensor_temperature This script is called when an event occurs on a tem-
sensor_voltage This script is called when an event occurs on a volt-
The following event is defined for all scripts but is only sent if a
critical/warning or any other event was previously sent:
normal A normal state/capacity/condition was triggered.
The following events are defined for fan, indicator, power, resistance,
temperature and voltage sensors:
critical A critical condition was triggered.
critical-under A critical under condition was triggered.
critical-over A critical over condition was triggered.
warning-under A warning under condition was triggered.
warning-over A warning over condition was triggered.
The following events are defined only for battery sensors:
user-capacity Capacity dropped below the limit set by the user.
low-power System is running in low power, that means that there
is not any AC Adapter connected and all batteries are
in critical or low capacity. When this event is
received there's no much time so you should only sus-
pend or shutdown the system. The script shutdowns the
system gracefully by default.
The following events are defined for drive and battery sensors:
state-changed The state on the sensor has been changed and it's not
in normal state.
The following is an example of how a temperature sensor script might be
invoked when a critical over condition is triggered:
/etc/powerd/scripts/sensor_temperature lm0 critical-over "CPU Temp"
acpi(4), acpiacad(4), acpibut(4), acpilid(4), envsys(4), i386/apm(4)
powerd first appeared in NetBSD 2.0. Support to handle envsys(4) events
appeared in NetBSD 5.0.
powerd was written by Jason R. Thorpe <email@example.com> and
contributed by Wasabi Systems, Inc.
Juan Romero Pardines added support to handle envsys(4) events.
Due to its synchronous nature powerd cannot be trusted to handle events
within a certain time.
NetBSD 5.0 December 22, 2007 NetBSD 5.0