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

NAME
     powerd -- power management daemon for sysmon

SYNOPSIS
     powerd [-d]

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 arguments.  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 will be sent to stderr and
           powerd will stay in the foreground of the controlling terminal.

CONFIGURATION SCRIPTS
     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
     in /etc/powerd/scripts.

     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-
                   ton device.

     reset_button  This script is called when an event occurs on a reset but-
                   ton device.

     sleep_button  This script is called when an event occurs on a sleep but-
                   ton 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 but-
                   ton device.

     The following events are defined for power switch devices:

     pressed   The button was pressed, the lid closed, or the AC adapter con-
               nected.

     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 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 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.

     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 indi-
                         cator/integer sensor.

     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 tem-
                         perature sensor.

     sensor_voltage      This script is called when an event occurs on a volt-
                         age sensor.

     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"

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.

NetBSD 5.1                     December 22, 2007                    NetBSD 5.1

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