1.\" Copyright (c) 2005 Nate Lawson 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd November 6, 2005 28.Dt POWERD 8 29.Os 30.Sh NAME 31.Nm powerd 32.Nd "system power control utility" 33.Sh SYNOPSIS 34.Nm 35.Op Fl a Ar mode 36.Op Fl b Ar mode 37.Op Fl i Ar percent 38.Op Fl n Ar mode 39.Op Fl p Ar ival 40.Op Fl P Ar pidfile 41.Op Fl r Ar percent 42.Op Fl v 43.Sh DESCRIPTION 44The 45.Nm 46utility monitors the system state and sets various power control options 47accordingly. 48It offers three modes (maximum, minimum, and adaptive) that can be 49individually selected while on AC power or batteries. 50The modes maximum, minimum, and adaptive may be abbreviated max, min, adp. 51.Pp 52Maximum mode chooses the highest performance values. 53Minimum mode selects the lowest performance values to get the most power 54savings. 55Adaptive mode attempts to strike a balance by degrading performance when 56the system appears idle and increasing it when the system is busy. 57It offers a good balance between a small performance loss for greatly 58increased power savings. 59The default mode is 60adaptive. 61.Pp 62The 63.Nm 64utility recognizes the following runtime options: 65.Bl -tag -width ".Fl r Ar percent" 66.It Fl a Ar mode 67Selects the 68.Ar mode 69to use while on AC power. 70.It Fl b Ar mode 71Selects the 72.Ar mode 73to use while on battery power. 74.It Fl i Ar percent 75Specifies the CPU idle percent level when 76adaptive 77mode should begin to degrade performance to save power. 78The default is 90% or higher. 79.It Fl n Ar mode 80Selects the 81.Ar mode 82to use normally when the AC line state is unknown. 83.It Fl p Ar ival 84Specifies a different polling interval (in milliseconds) for AC line state 85and system idle levels. 86The default is 500 ms. 87.It Fl P Ar pidfile 88Specifies an alternative file in which the process ID should be stored. 89The default is 90.Pa /var/run/powerd.pid . 91.It Fl r Ar percent 92Specifies the CPU idle percent level where 93adaptive 94mode should consider the CPU running and increase performance. 95The default is 65% or lower. 96.It Fl v 97Verbose mode. 98Messages about power changes will be printed to stdout and 99.Nm 100will operate in the foreground. 101.El 102.Sh SEE ALSO 103.Xr acpi 4 , 104.Xr apm 4 , 105.Xr cpufreq 4 106.Sh HISTORY 107The 108.Nm 109utility first appeared in 110.Fx 6.0 . 111.Sh AUTHORS 112.An -nosplit 113.An Colin Percival 114first wrote 115.Nm estctrl , 116the utility that 117.Nm 118is based on. 119.An Nate Lawson 120then updated it for 121.Xr cpufreq 4 , 122added features, and wrote this manual page. 123.Sh BUGS 124The 125.Nm 126utility should also power down idle disks and other components besides the CPU. 127.Pp 128If 129.Nm 130is used with 131.Pa power_profile , 132they may override each other. 133.Pp 134The 135.Nm 136utility 137should probably use the 138.Xr devctl 4 139interface instead of polling for AC line state. 140