APM(8) | System Manager's Manual | APM(8) |
apm
, zzz
—
apm |
[-abdlmSsvz ] [-f
sockname] |
zzz |
[-Sz ] [-f
sockname] |
apm
program communicates with the Advanced Power
Management (APM) daemon, apmd(8),
making requests of the current power status or placing the system either into
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:
-a
-b
-d
-f
sockname-l
-m
-S
-s
-v
-z
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.
-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.
Intel Corporation and Microsoft Corporation, Advanced Power Management (APM) BIOS Interface Specification, Revision 1.2, February 1996.
apm
command appeared in NetBSD
1.3.
The APM specification first appeared in 1992. The last update to
the standard was made in 1996 - the same year when it was superceded by the
ACPI 1.0 standard. Thereafter power management on IBM-compatible personal
computers has relied on ACPI, implemented in NetBSD
by the acpi(4) subsystem. The
acpi(4) provides an emulation
layer for the legacy apm
.
March 20, 2010 | NetBSD 9.4 |