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POWERD (8) | System administration commands and daemons | Unix Manual Pages | :man

NAME

powerd - "system power control utility"

CONTENTS

Synopsis
Description
See Also
History
Authors
Bugs

SYNOPSIS

powerd [-a mode] [-b mode] [-i percent] [-n mode] [-p ival] [-r percent] [-v]

DESCRIPTION

The powerd utility monitors the system state and sets various power control options accordingly. It offers three modes (maximum, minimum, and adaptive) that can be individually selected while on AC power or batteries.

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.

The powerd utility recognizes the following runtime options:

-a mode Selects the mode to use while on AC power.
-b mode Selects the mode to use while on battery power.
-i percent Specifies the CPU idle percent level when adaptive mode should begin to degrade performance to save power. The default is 90% or higher.
-n mode Selects the mode to use normally when the AC line state is unknown.
-p ival Specifies a different polling interval (in milliseconds) for AC line state and system idle levels. The default is 500 ms.
-r percent Specifies the CPU idle percent level where adaptive mode should consider the CPU running and increase performance. The default is 65% or lower.
-v Verbose mode. Messages about power changes will be printed to stdout and powerd will operate in the foreground.

SEE ALSO

acpi(4), apm(4), cpufreq(4)

HISTORY

AUTHORS

cpufreq(4),

BUGS

devctl(4)


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