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apm, zzz, ZZZ(8/amd64) Advanced Power Management control program
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apm, zzz, ZZZ(8/sparc64) Advanced Power Management control program

APM(8) System Manager's Manual APM(8)


apm, zzz, ZZZAdvanced Power Management control program


apm [-AabHLlmPSvZz] [-f sockname]

zzz [-SZz] [-f sockname]

ZZZ [-SZz] [-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:
Switch to automatic performance adjustment mode.
Display the external charger (A/C status). 0 means disconnected, 1 means connected, 2 means backup power source, and 255 means unknown.
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.
Set hw.setperf to 100.
Set hw.setperf to 0.
Display the estimated battery lifetime (in percent).
Display the estimated battery lifetime (in minutes).
Display the performance adjustment mode. 0 means manual mode. 1 means automatic mode.
Put the system into stand-by (light sleep) state.
Request more verbose description of the displayed states.
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.
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.


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.
August 4, 2015 OpenBSD-current