apm, zzz,
ZZZ —
Advanced Power Management control
program
apm |
[-AabHLlmPSvZz] [-f
sockname] |
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. With no flags,
apm displays the current power management state in
verbose form.
The options are as follows:
-A- Switch to automatic performance adjustment mode.
-a- Display the external charger (AC) status. 0 means disconnected, 1 means
connected, 2 means backup power source, and 255 means unknown.
-b- Display the battery status. 0 means high, 1 means low, 2 means critical, 3
means charging, 4 means absent, and 255 means unknown.
-f
sockname- Set the name of the socket via which to contact
apmd(8) to
sockname.
-H- Switch to manual performance adjustment mode, setting
hw.setperf to 100.
-L- Switch to manual performance adjustment mode, setting
hw.setperf to 0.
-l- Display the estimated battery lifetime, in percent.
-m- Display the estimated battery lifetime, in minutes. If charging, the
estimated time to fully charge is displayed instead.
-P- Display the performance adjustment mode. 0 means manual mode. 1 means
automatic mode.
-S- Put the system into stand-by (light sleep) state.
-v- Request more verbose description of the displayed states.
-Z- Put the system into hibernation. System memory is saved to disk (swap
space) and the machine is powered down. For machines supporting the
acpi(4)
style hibernate functionality, on resume a full kernel boot will occur,
followed by the reading of the saved memory image. The image will then be
unpacked and the system resumed at the point immediately after the
hibernation request.
-z- Put the system into suspend (deep sleep) state.
The zzz and ZZZ
commands are shortcuts for suspending and hibernating the system,
respectively. With no arguments, they are placed into their respective
states. The command line flags serve the same purpose as for
apm.
These commands do not wait for positive confirmation that the
requested state has been entered; to do so would mean the command does not
return until the system resumes from its sleep state.
Each system provides methods for waking from suspend or hibernate.
For those machines supporting acpi(4) style suspend/resume (or hibernate/unhibernate)
semantics, the wakeup devices for each sleep state are printed during system
boot in dmesg(8).
The system will attempt to provide as much feedback as is possible
on the specific hardware being suspended/resumed. This includes setting
system LEDs or other indicators to illustrate progress throughout the
suspend/resume (or hibernate/unhibernate) process. Such feedback is
machine-dependent.
- /var/run/apmdev
- The default Unix-domain socket for communicating
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.
apm(4), apmd(8)
Advanced Power Management (APM) BIOS Interface Specification
(revision 1.2), Intel Corporation and Microsoft Corporation
The apm command appeared in
NetBSD 1.3; OpenBSD support
was added in OpenBSD 1.2.