NAME
apm,
zzz
- Advanced Power Management control program
SYNOPSIS
apm
[-abdlmsSvz]
[-f sockname]
zzz
[-Sz]
[-f sockname]
DESCRIPTION
apm
communicates with the Advanced Power Management daemon,
apmd(8),
making requests of it for current power status or to place the system
into a suspend or stand-by state.
The
apm
tool is only installed on supported platforms.
With no flags,
apm
displays the current power management state in verbose form.
Available command-line flags are:
- -z
-
Put the system into suspend (deep sleep) mode.
- -S
-
Put the system into stand-by (light sleep) mode.
- -l
-
Display the estimated battery lifetime in percent.
- -m
-
Display the estimated battery lifetime in minutes.
- -b
-
Display the battery status. 0 means high, 1 means low, 2 means
critical, 3 means charging, 4 means absent, and 255 means unknown.
- -a
-
Display the external charger (A/C status). 0 means disconnected, 1
means connected, 2 means backup power source, and 255 means unknown.
- -s
-
Display if power management is enabled.
- -v
-
Request more verbose description of the displayed states.
- -f sockname
-
Set the name of the socket via which to contact
apmd(8)
to
sockname
.
- -d
-
Do not communicate with the APM daemon; attempt instead to manipulate
the APM control device directly.
The
zzz
variant of this command is an alternative for suspending the system.
With no arguments,
zzz
places the system into suspend mode.
The command line flags serve the same purpose as for the
apm
variant of this command.
This command does not wait for positive confirmation that the requested
mode has been entered; to do so would mean the command does not return
until the system resumes from its sleep state.
FILES
/var/run/apmdev
is the default UNIX-domain socket used for communication with
apmd(8).
The
-f
flag may be used to specify an alternate socket name.
The protection modes on this socket govern which users may access the
APM functions.
/dev/apmctl
is the control device which is used when the
-d
flag is specified; it must be writable for the
-d
flag to work successfully.
/dev/apm
is the status device used when the socket is not accessible; it must be
readable to provide current APM status.
SEE ALSO
apm(4),
apmd(8)
REFERENCES
Advanced Power Management (APM) BIOS Interface Specification (revision
1.1), Intel Corporation and Microsoft Corporation
HISTORY
The
apm
command appeared in
NetBSD1.3.