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Diffstat (limited to 'usr.sbin/powerd/powerd.8')
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diff --git a/usr.sbin/powerd/powerd.8 b/usr.sbin/powerd/powerd.8 new file mode 100644 index 0000000..80cf607 --- /dev/null +++ b/usr.sbin/powerd/powerd.8 @@ -0,0 +1,128 @@ +.\" 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 February 26, 2005 +.Dt POWERD 8 +.Os +.Sh NAME +.Nm powerd +.Nd system power control utility +.Sh SYNOPSIS +.Nm +.Op Fl a mode +.Op Fl b mode +.Op Fl i percent +.Op Fl n mode +.Op Fl p ival +.Op Fl r percent +.Op Fl v +.Sh DESCRIPTION +The +.Nm +utility monitors the system state and sets various power control options +accordingly. +It offers three modes (max, min, and adaptive) that can be +individually selected while on AC power or batteries. +.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. +The default mode is +adaptive. +.Pp +The +.Nm +utility recognizes the following runtime options: +.Bl -tag -width -i_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 idle percent level when +adaptive +mode should begin to degrade performance to save power. +The default is 75% or higher. +.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 500 ms. +.It Fl r Ar percent +Specifies the CPU idle percent level where +adaptive +mode should consider the CPU running and increase performance. +The default is 50% or lower. +.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 5.5 . +.Sh AUTHORS +.An Colin Percival +first wrote +.Pa estctrl , +the utility that +.Nm +is based on. +.An Nate Lawson +then updated it for +.Xr cpufreq 4 , +added features, and wrote this man page. +.Sh BUGS +The +.Nm +utility should also power down idle disks and other components besides the CPU. +.Pp +If +.Nm +is used with power_profile, they may override each other. +.Pp +.Nm +should probably use the +.Xr devctl 4 +interface instead of polling for AC line state. |