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-.\" Copyright (c) 2005 Nate Lawson
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd December 21, 2009
-.Dt POWERD 8
-.Os
-.Sh NAME
-.Nm powerd
-.Nd "system power control utility"
-.Sh SYNOPSIS
-.Nm
-.Op Fl a Ar mode
-.Op Fl b Ar mode
-.Op Fl i Ar percent
-.Op Fl m Ar freq
-.Op Fl M Ar freq
-.Op Fl n Ar mode
-.Op Fl p Ar ival
-.Op Fl P Ar pidfile
-.Op Fl r Ar percent
-.Op Fl v
-.Sh DESCRIPTION
-The
-.Nm
-utility monitors the system state and sets various power control options
-accordingly.
-It offers four modes (maximum, minimum, adaptive and hiadaptive) that can be
-individually selected while on AC power or batteries.
-The modes maximum, minimum, adaptive and hiadaptive may be abbreviated
-max, min, adp, hadp.
-.Pp
-Maximum mode chooses the highest performance values.
-Minimum mode selects the lowest performance values to get the most power
-savings.
-Adaptive mode attempts to strike a balance by degrading performance when
-the system appears idle and increasing it when the system is busy.
-It offers a good balance between a small performance loss for greatly
-increased power savings.
-Hiadaptive mode is like adaptive mode, but tuned for systems where
-performance and interactivity are more important than power consumption.
-It increases frequency faster, reduces the frequency less aggressively and
-will maintain full frequency for longer.
-The default mode is adaptive for battery power and hiadaptive for the rest.
-.Pp
-The
-.Nm
-utility recognizes the following runtime options:
-.Bl -tag -width ".Fl r Ar percent"
-.It Fl a Ar mode
-Selects the
-.Ar mode
-to use while on AC power.
-.It Fl b Ar mode
-Selects the
-.Ar mode
-to use while on battery power.
-.It Fl i Ar percent
-Specifies the CPU load percent level when adaptive
-mode should begin to degrade performance to save power.
-The default is 50% or lower.
-.It Fl m Ar freq
-Specifies the minimum frequency to throttle down to.
-.It Fl M Ar freq
-Specifies the maximum frequency to throttle up to.
-.It Fl n Ar mode
-Selects the
-.Ar mode
-to use normally when the AC line state is unknown.
-.It Fl p Ar ival
-Specifies a different polling interval (in milliseconds) for AC line state
-and system idle levels.
-The default is 250 ms.
-.It Fl P Ar pidfile
-Specifies an alternative file in which the process ID should be stored.
-The default is
-.Pa /var/run/powerd.pid .
-.It Fl r Ar percent
-Specifies the CPU load percent level where adaptive
-mode should consider the CPU running and increase performance.
-The default is 75% or higher.
-.It Fl v
-Verbose mode.
-Messages about power changes will be printed to stdout and
-.Nm
-will operate in the foreground.
-.El
-.Sh SEE ALSO
-.Xr acpi 4 ,
-.Xr apm 4 ,
-.Xr cpufreq 4
-.Sh HISTORY
-The
-.Nm
-utility first appeared in
-.Fx 6.0 .
-.Sh AUTHORS
-.An -nosplit
-.An Colin Percival
-first wrote
-.Nm estctrl ,
-the utility that
-.Nm
-is based on.
-.An Nate Lawson
-then updated it for
-.Xr cpufreq 4 ,
-added features, and wrote this manual page.
-.Sh BUGS
-The
-.Nm
-utility should also power down idle disks and other components besides the CPU.
-.Pp
-If
-.Nm
-is used with
-.Pa power_profile ,
-they may override each other.
-.Pp
-The
-.Nm
-utility
-should probably use the
-.Xr devctl 4
-interface instead of polling for AC line state.