apmd man page on OpenBSD

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APMD(8)			OpenBSD System Manager's Manual		       APMD(8)

     apmd - Advanced Power Management daemon

     apmd [-AaCdHLs] [-f devname] [-S sockname] [-t seconds]

     apmd monitors the advanced power management device, apm(4), acting on
     signaled events and upon user requests as sent by the apm(8) program.

     For suspend and standby request events delivered by the BIOS, or via
     apm(8), apmd runs the appropriate configuration program (if one exists),
     syncs the buffer cache to disk and initiates the requested state.	When
     resuming after suspend or standby, apmd runs the appropriate
     configuration program (if one exists).

     When the power status changes (battery is connected or disconnected) apmd
     fetches the current status and reports it via syslog(3) with logging
     facility LOG_DAEMON.

     The options are as follows:

     -A	     Start apmd in automatic performance adjustment mode.  In this
	     mode, when CPU idle time falls below 10%, or if the AC power is
	     connected and the battery is more than 15% charged, or if the
	     battery is absent, apmd raises hw.setperf to 100.	Otherwise when
	     CPU idle time is above 30% and the system is running on battery
	     power, apmd lowers hw.setperf as much as possible to reduce power

     -a	     BIOS-initiated suspend or standby requests are ignored if the
	     system is connected to line current and not running from
	     batteries (user requests are still honored).

     -C	     Start apmd in cool running performance adjustment mode.  In this
	     mode, when CPU idle time falls below 10%, apmd raises hw.setperf
	     as much as necessary.  Otherwise when CPU idle time is above 30%,
	     apmd lowers hw.setperf as much as possible to reduce heat, noise,
	     and power consumption.

     -d	     apmd enters debug mode, logging to facility LOG_LOCAL1, and stays
	     in the foreground on the controlling terminal.

     -f devname
	     Specify an alternate device file name, devname.

     -H	     Start apmd in manual performance adjustment mode, initialising
	     hw.setperf to 100.

     -L	     Start apmd in manual performance adjustment mode, initialising
	     hw.setperf to 0.

     -S sockname
	     Specify an alternate socket name, sockname.  The socket is
	     protected to mode 0660, UID 0, GID 0; this protects access to
	     suspend requests to authorized users only.

     -s	     Current battery statistics are reported via syslog(3) and apmd
	     exits without monitoring the APM status.

     -t seconds
	     apmd periodically polls the APM driver for the current power
	     state.  If the battery charge level changes substantially or the
	     external power status changes, the new status is logged.  The
	     polling rate defaults to once per 10 minutes, but may be
	     specified using the -t command-line flag.

     When a client requests a suspend or stand-by state, apmd does not wait
     for positive confirmation that the requested state has been entered
     before replying to the client; to do so would mean the client does not
     get a reply until the system resumes from its sleep state.	 Rather, apmd
     replies with the intended state to the client and then places the system
     in the requested state after running the configuration script and
     flushing the buffer cache.

     Actions can be configured for the following five transitions: suspend,
     standby, resume, powerup, and powerdown.  The suspend and standby actions
     are run prior to apmd performing any other actions (such as disk syncs)
     and entering the new state.  The resume program is run after resuming
     from a stand-by or suspended state.  The powerup and powerdown programs
     are run after the power status (AC connected or not) changes, as well as
     after a resume (if the power status changed in the mean time).

     /dev/apmctl	   Default device used to control the APM kernel

     /etc/apm/powerdown	   These files contain the host's customized actions.
			   Each file must be an executable binary or shell
			   script.  A single program or script can be used to
			   control all transitions by examining the name by
			   which it was called, which is one of suspend,
			   standby, resume, powerup, or powerdown.

     /var/run/apmdev	   Default UNIX-domain socket used for communication
			   with apm(8).

     syslog(3), apm(4), apm(8), sysctl(8)

     Advanced Power Management (APM) BIOS Interface Specification (revision
     1.2), Intel Corporation and Microsoft Corporation.

     The apmd command first appeared in NetBSD 1.3.  OpenBSD support was added
     in OpenBSD 1.2.

OpenBSD 4.9		       October 28, 2010			   OpenBSD 4.9

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