NetBSD/usr.sbin/powerd/powerd.8

.\"	$NetBSD: powerd.8,v 1.19 2009/05/04 19:11:49 wiz Exp $
.\"
.\" Copyright (c) 2003 Wasabi Systems, Inc.
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.\" Written by Jason R. Thorpe for Wasabi Systems, Inc.
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.Dd December 22, 2007
.Dt POWERD 8
.Os
.Sh NAME
.Nm powerd
.Nd power management daemon for sysmon
.Sh SYNOPSIS
.Nm
.Op Fl d
.Sh DESCRIPTION
.Nm
acts upon power management events posted by the kernel's power management
facility.
When events are posted,
.Nm
translates the event into a script name and a list of arguments.
.Nm
then runs the script in order to implement the power management policy
defined by the system administrator.
.Pp
.Nm
supports the following option:
.Bl -tag -width xxxx
.It Fl d
Enable debugging mode.
Verbose messages will be sent to stderr and
.Nm
will stay in the foreground of the controlling terminal.
.El
.Sh CONFIGURATION SCRIPTS
All of
.Nm
configuration is encapsulated into scripts that are run when power
management events occur.
.Nm
will look for these scripts in two locations.
The first location is
.Pa /etc/powerd/scripts/\*[Lt]power_type\*[Gt] ,
where
.Aq Pa power_type
is defined by the power management mechanism supported by the system,
e.g.,
.Dq apm
or
.Dq acpi .
If the script is not found in the first location,
.Nm
looks in
.Pa /etc/powerd/scripts .
.Pp
Configuration scripts are run synchronously, i.e.,
.Nm
will start the script and wait for its completion before it handles
the next event.
.Pp
Configuration scripts are called with different arguments, depending on
the script class.
These classes are described in the following sections.
.Ss 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.
.Pp
The following power switch script names are defined:
.Bl -tag -width "power_button"
.It power_button
This script is called when an event occurs on a power button device.
.It reset_button
This script is called when an event occurs on a reset button device.
.It sleep_button
This script is called when an event occurs on a sleep button device.
.It lid_switch
This script is called when an event occurs on a lid switch device.
.It acadapter
This script is called when an online or offline event occurs on an
AC adapter device.
.It hotkey_button
This script is called when an event occurs on a hotkey button device.
.El
.Pp
The following events are defined for power switch devices:
.Bl -tag -width "released"
.It pressed
The button was pressed, the lid closed, or the AC adapter connected.
.It released
The button was released, the lid opened, or the AC adapter disconnected.
Note that power and sleep button devices usually do not
post this type of event.
.El
.Pp
The following is an example of how a power button script might be invoked
when a power button is pressed by the operator:
.Bd -literal -offset indent
/etc/powerd/scripts/power_button acpi0 pressed
.Ed
.Ss ENVSYS SCRIPTS
.Xr 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
.Sy sensor_drive
and the
.Sy sensor_battery
scripts uses a fourth argument: state description.
.Pp
The following envsys script names are defined:
.Bl -tag -width "sensor_temperature"
.It sensor_battery
This script is called when an event occurs on a battery sensor
(Wh/Ah/Battery state).
.It sensor_drive
This script is called when an event occurs on a drive sensor.
.It sensor_fan
This script is called when an event occurs on a fan sensor.
.It sensor_indicator
This script is called when an event ocurrs on a indicator/integer sensor.
.It sensor_power
This script is called when an event occurs on a power sensor (W/Ampere).
.It sensor_resistance
This script is called when an event occurs on a resistance sensor (Ohm).
.It sensor_temperature
This script is called when an event occurs on a temperature sensor.
.It sensor_voltage
This script is called when an event occurs on a voltage sensor.
.El
.Pp
The following event is defined for all scripts but is only sent if
a critical/warning or any other event was previously sent:
.Bl -tag -width "sensor_temperature"
.It normal
A normal state/capacity/condition was triggered.
.El
.Pp
The following events are defined for fan, indicator, power,
resistance, temperature and voltage sensors:
.Bl -tag -width "sensor_temperature"
.It critical
A critical condition was triggered.
.It critical-under
A critical under condition was triggered.
.It critical-over
A critical over condition was triggered.
.It warning-under
A warning under condition was triggered.
.It warning-over
A warning over condition was triggered.
.El
.Pp
The following events are defined only for battery sensors:
.Bl -tag -width "sensor_temperature"
.It user-capacity
Capacity dropped below the limit set by the user.
.It 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
suspend or shutdown the system.
The script shutdowns the system gracefully by default.
.El
.Pp
The following events are defined for drive and battery sensors:
.Bl -tag -width "sensor_temperature"
.It state-changed
The state on the sensor has been changed and it's not in normal state.
.El
.Pp
The following is an example of how a temperature sensor script might be
invoked when a critical over condition is triggered:
.Bd -literal -offset indent
/etc/powerd/scripts/sensor_temperature lm0 critical-over "CPU Temp"
.Ed
.Sh SEE ALSO
.Xr acpi 4 ,
.Xr acpiacad 4 ,
.Xr acpibut 4 ,
.Xr acpilid 4 ,
.Xr envsys 4 ,
.Xr i386/apm 4
.Sh HISTORY
.Nm
first appeared in
.Nx 2.0 .
Support to handle
.Xr envsys 4
events appeared in
.Nx 5.0 .
.Sh AUTHORS
.Nm
was written by
.An Jason R. Thorpe
.Aq thorpej@wasabisystems.com
and contributed by Wasabi Systems, Inc.
.An Juan Romero Pardines
added support to handle
.Xr envsys 4
events.
.Sh BUGS
Due to its synchronous nature
.Nm
cannot be trusted to handle events within a certain time.