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 December 21, 2009 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 m Ar freq 39.Op Fl M Ar freq 40.Op Fl n Ar mode 41.Op Fl p Ar ival 42.Op Fl P Ar pidfile 43.Op Fl r Ar percent 44.Op Fl v 45.Sh DESCRIPTION 46The 47.Nm 48utility monitors the system state and sets various power control options 49accordingly. 50It offers four modes (maximum, minimum, adaptive and hiadaptive) that can be 51individually selected while on AC power or batteries. 52The modes maximum, minimum, adaptive and hiadaptive may be abbreviated 53max, min, adp, hadp. 54.Pp 55Maximum mode chooses the highest performance values. 56Minimum mode selects the lowest performance values to get the most power 57savings. 58Adaptive mode attempts to strike a balance by degrading performance when 59the system appears idle and increasing it when the system is busy. 60It offers a good balance between a small performance loss for greatly 61increased power savings. 62Hiadaptive mode is like adaptive mode, but tuned for systems where 63performance and interactivity are more important than power consumption. 64It increases frequency faster, reduces the frequency less aggressively and 65will maintain full frequency for longer. 66The default mode is adaptive for battery power and hiadaptive for the rest. 67.Pp 68The 69.Nm 70utility recognizes the following runtime options: 71.Bl -tag -width ".Fl r Ar percent" 72.It Fl a Ar mode 73Selects the 74.Ar mode 75to use while on AC power. 76.It Fl b Ar mode 77Selects the 78.Ar mode 79to use while on battery power. 80.It Fl i Ar percent 81Specifies the CPU load percent level when adaptive 82mode should begin to degrade performance to save power. 83The default is 50% or lower. 84.It Fl m Ar freq 85Specifies the minimum frequency to throttle down to. 86.It Fl M Ar freq 87Specifies the maximum frequency to throttle up to. 88.It Fl n Ar mode 89Selects the 90.Ar mode 91to use normally when the AC line state is unknown. 92.It Fl p Ar ival 93Specifies a different polling interval (in milliseconds) for AC line state 94and system idle levels. 95The default is 250 ms. 96.It Fl P Ar pidfile 97Specifies an alternative file in which the process ID should be stored. 98The default is 99.Pa /var/run/powerd.pid . 100.It Fl r Ar percent 101Specifies the CPU load percent level where adaptive 102mode should consider the CPU running and increase performance. 103The default is 75% or higher. 104.It Fl v 105Verbose mode. 106Messages about power changes will be printed to stdout and 107.Nm 108will operate in the foreground. 109.El 110.Sh SEE ALSO 111.Xr acpi 4 , 112.Xr apm 4 , 113.Xr cpufreq 4 114.Sh HISTORY 115The 116.Nm 117utility first appeared in 118.Fx 6.0 . 119.Sh AUTHORS 120.An -nosplit 121.An Colin Percival 122first wrote 123.Nm estctrl , 124the utility that 125.Nm 126is based on. 127.An Nate Lawson 128then updated it for 129.Xr cpufreq 4 , 130added features, and wrote this manual page. 131.Sh BUGS 132The 133.Nm 134utility should also power down idle disks and other components besides the CPU. 135.Pp 136If 137.Nm 138is used with 139.Pa power_profile , 140they may override each other. 141.Pp 142The 143.Nm 144utility 145should probably use the 146.Xr devctl 4 147interface instead of polling for AC line state. 148