Import powerd(8), a utility for managing power consumption. Currently, it

just uses cpufreq(4) but in the future it should also do things like spin
down disks.  This is based on the work by Colin Percival (called "estctrl").

1 files changed, 128 insertions, 0 deletions

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.