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NetBSD 6.1.5 - man page for powerd (netbsd section 8)

POWERD(8)			   BSD System Manager's Manual				POWERD(8)

NAME
     powerd -- power management daemon for sysmon

SYNOPSIS
     powerd [-dn]

DESCRIPTION
     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 argu-
     ments.  powerd then runs the script in order to implement the power management policy
     defined by the system administrator.

     powerd supports the following option:

     -d    Enable debugging mode.  Verbose messages and all messages intended for syslog(8) will
	   be sent to stderr, and powerd will stay in the foreground of the controlling terminal.

     -n    Prevent execution of power management scripts.

CONFIGURATION SCRIPTS
     All configuration of powerd is encapsulated into scripts that are run when power management
     events occur.  The daemon will look for the scripts from the directory /etc/powerd/scripts.

     Configuration scripts are run synchronously; 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 event is asso-
     ciated, 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 button device.

     reset_button   This script is called when an event occurs on a reset button device.

     sleep_button   This script is called when an event occurs on a sleep button device.

     lid_switch     This script is called when an event occurs on a lid switch device.

     acadapter	    This script is called when an online or offline event occurs on an AC adapter
		    device.

     hotkey_button  This script is called when an event occurs on a hotkey button device.

     The following events are defined for power switch devices:

     pressed	    The button was pressed, the lid was closed, or the AC adapter was connected.

     released	    The button was released, the lid was opened, or the AC adapter was discon-
		    nected.  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 but-
     ton is pressed by the operator:

	   /etc/powerd/scripts/power_button acpibut0 pressed

   ENVSYS SCRIPTS
     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 the 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 battery sensor
			 (Wh/Ah/Battery state).

     sensor_drive	 This script is called when an event occurs on a drive sensor.

     sensor_fan 	 This script is called when an event occurs on a fan sensor.

     sensor_indicator	 This script is called when an event ocurrs on a indicator/integer sen-
			 sor.

     sensor_power	 This script is called when an event occurs on a power sensor (W/Ampere).

     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 temperature sensor.

     sensor_voltage	 This script is called when an event occurs on a voltage sensor.

     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 event is defined for all scripts, but it is only sent if any of the previous
     events has been previously sent:

     normal		 A normal state/capacity/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.  This implies that the AC adapter is
			 disconnected and all batteries are in critical or low capacity.  The
			 script shutdowns the system gracefully by default.

     The following events are defined for drive and battery sensors:

     state-changed	 The state of the sensor has been changed and it is not in the normal
			 state.

     The following is an example of how a temperature sensor script might be invoked when a crit-
     ical over condition is triggered:

	   /etc/powerd/scripts/sensor_temperature lm0 critical-over "CPU Temp"

SEE ALSO
     acpi(4), acpiacad(4), acpibut(4), acpilid(4), envsys(4), i386/apm(4)

HISTORY
     powerd first appeared in NetBSD 2.0.  Support to handle envsys(4) events appeared in
     NetBSD 5.0.

AUTHORS
     powerd was written by Jason R. Thorpe <thorpej@wasabisystems.com> and contributed by Wasabi
     Systems, Inc.
     Juan Romero Pardines added support to handle envsys(4) events.

BUGS
     Due to its synchronous nature powerd cannot be trusted to handle events within a certain
     time.

BSD					December 15, 2010				      BSD


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