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APMD(8) APMD(8)
NAME
apmd - Advanced Power Management (APM) daemon
SYNOPSIS
apmd [ -TVWciqv ] [ -P program ] [ -T seconds ] [ -c seconds ] [ -p percent ] [ -v
level ] [ -w percent ]
DESCRIPTION
apmd is an monitoring daemon for the Advanced Power Management (APM) subsystem.
The APM subsystem consists of power-management hardware, firmware usually referred
to as the APM BIOS and a driver in the operating system kernel. The daemon can
execute a program (usually a shell script) when events are reported by the APM sub-
system, and will log, via syslogd(8), certain changes in power status. When the
available battery power becomes very low it can alert the user.
When the APM subsystem notifies the daemon of a pending suspend or standby request,
apmd will run a proxy program, log the event, sync(2) data to the disk and then
tell the APM subsystem to continue its operation.
Preparations for power management events are made mainly by the proxy program spec-
ified using the -P option. The proxy program is invoked with one or two arguments:
start Invoked when the daemon starts.
stop Invoked when the daemon stops.
standby ( system | user )
Invoked when the APM subsystem reports that standby has been initiated. The
second parameter indicates whether firmware ("system") or software ("user")
was the originator of the event.
The "standby" mode conserves power but leaves the machine able to respond
almost immediately to user activity. Most laptops can’t stay in standby
mode on battery power for more than a few hours or a day. Normally, nothing
special needs to be done to prepare for "standing by".
suspend ( system | user )
Invoked when the APM subsystem reports that suspension has been initiated.
The second parameter indicates whether firmware ("system") or software
("user") was the originator of the event.
The "suspend" mode aggressively conserves power. Usually this involves
shutting off power to all devices except the CPU core and memory, which are
put into a very low power mode. Most laptops can stay suspended, using bat-
tery power alone, for several days. ("Hibernation" is a kind of super-sus-
pend, where all that state is written to disk and the machine uses no power.
Hibernation is treated like suspension by the APM subsystem.)
Before suspending, PCMCIA devices may need to be disabled using cardctl(8),
and some modular device drivers may need to be unloaded if they have not
been designed to support power management.
resume ( suspend | standby | critical )
Invoked when the APM subsystem reports that computer has resumed normal
operation. The second parameter indicates the kind of event from which the
system is resuming. (A "critical" suspend is a suspension that the APM sub-
system performs in an emergency. Some kernels do not pass this event to
user space. If apmd receives the event, it acknowledges the event and exits
immediately without logging or running the proxy program.)
When resuming, PCMCIA devices may need to be re-enabled using cardctl(8),
and some modular drivers may need to be reloaded. Note that in the case of
a critical suspend, the system state may not have been completely saved.
change power
Invoked when the APM subsystem reports a change in power status, such as a
switch from mains to battery power.
change battery
Invoked when the APM subsystem reports that the charge of one or more bat-
teries is low. A few minutes of battery power may remain.
change capability
Invoked when the APM subsystem reports some change in power management capa-
bilities. It may have been caused by operation of a setup utility, or by
the installation or removal of devices.
apmd emits various messages, most of which are self-explanatory. Battery status
log entries contain three fields, separated by commas. The first field indicates
how full the battery is as a percentage of its capacity. The second field indi-
cates whether the battery is charging, not charging, or discharging. When possi-
ble, apmd adds in parentheses its estimate of the rate of charging or discharging.
The third field indicates how much time the battery can or could be used to power
the computer. This information is provided by the APM subsystem. When possible,
apmd adds in parentheses its own estimate of the battery life (if discharging) or
of the time required to charge the battery fully (if charging).
OPTIONS
-P program, --proxy program
Specifies the proxy program to execute when events are received. See above
for information about the arguments supplied to this program.
-T [seconds] , --proxy-timeout [seconds]
Sets a time-out for the proxy. Without this option (or with this option and
a negative argument) apmd waits indefinitely for the proxy to finish. If
the proxy enters an infinite loop or wait then the machine may appear to
have crashed. If this option is given a positive integer argument then apmd
will wait only that many seconds for the proxy to finish, after which it
will log a warning, kill the proxy, and continue processing the event. The
default is 30 seconds.
-V, --version
Prints the version of the apmd program.
-W, --wall
In addition to logging low battery status (as determined either by the -w
level or by the firmware) using syslog(2), apmd will, given this option,
also use wall(1) to alert all users. This is most useful if syslogd(8) is
not set up to write ALERT messages to all users. If both methods are used,
more warnings will be made during the critical time period.
-c [seconds] , --check [seconds]
Controls how many seconds to wait for an event. Without this option (or
with this option and a negative argument) apmd waits indefinitely for an
event. If this option is given a positive integer argument then apmd will
wait only that many seconds before checking the battery level and possibly
sending out a warning, calling the proxy or making an entry in the log. The
default is 30 seconds.
-i, --ignore-bios-battery-low
Causes apmd to ignore a LOW BATTERY signal sent by the APM subsystem. Some
firmware signals a low battery at the wrong time. Note that LOW BATTERY
events may still be generated by apmd itself based on the warning level.
-p percent, --percentage percent
Controls how often the battery status is logged. A new line is printed each
time the battery content changes by percent_change if logging is enabled.
The default is 5. Use a value greater than 100 to disable periodic logging
of the battery level.
-q, --quiet-bios-battery-low
Causes apmd not to generate a warning when a LOW BATTERY signal is received
from the APM subsystem. The firmware on some machines produces an audible
warning when power is about to be used up, so an extra warning may not be
needed.
-v [level] , --verbose [level]
The daemon can generate messages of varying degrees of unimportance. Each
message is assigned one of the priority levels defined for the syslogd(8)
subsystem, ranging from 0 (EMERG, least unimportant) to 7 (DEBUG, most unim-
portant). This option sets the threshold level above which messages are
suppressed. Without an argument it increments the threshold by 1, thus mak-
ing apmd more verbose. The default is 5 (NOTICE).
-w percent, --warn percent
When the battery is not being charged and the battery content falls below
the specified percent of capacity, and no such event has yet occurred in the
current discharge cycle, apmd will log a warning at the ALERT log level to
syslog(2) and generate a LOW BATTERY event. If the -W or --wall option was
given, the daemon will also use wall(1) to alert all users of impending
doom. The default warning level is 10. Use a negative value to disable
this feature.
-h, --help
Causes apmd to print a brief command summary and exit.
BUGS
This daemon supports all APM events described in the APM BIOS specification version
1.2; however it fails to support some of the advanced features of APM 1.2, such as
reporting the conditions of multiple batteries. (Multiple batteries are currently
treated as if they were just one large one.)
Estimates of charge and discharge rates and times can be very inaccurate.
There is no interaction yet with ACPI support as found in newer PC hardware.
FILES
/dev/apm_bios
Device through which apmd communicates with the Linux APM driver.
/proc/apm
APM driver status information
/etc/apmd_proxy
Proxy program that is run if none is specified.
/etc/apm/apmd_proxy
Proxy program that is run if none is specified. (Debian)
AUTHOR
This program was written by Rik Faith (faith AT cs.edu) and may be freely dis-
tributed under the terms of the GNU General Public License. There is ABSOLUTELY NO
WARRANTY for this program. The current maintainer is Avery Pennarun (apen-
warr AT worldvisions.ca).
SEE ALSO
apm(1), xapm(1), cardctl(8), syslogd(8).
January 2004 APMD(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-07 20:00 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)