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- for -a, get the brackets right
- for -l and -m remove the brackets
- note that -m whilst charging now displays estimated recharge time
- A/C -> AC

from jan stary;
tweaked a little by myself

.\"	$OpenBSD: apm.8,v 1.45 2022/02/13 21:27:51 jmc Exp $
.\"
.\" Copyright (c) 1996 John T. Kohl
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.Dd $Mdocdate: February 13 2022 $
.Dt APM 8
.Os
.Sh NAME
.Nm apm ,
.Nm zzz ,
.Nm ZZZ
.Nd Advanced Power Management control program
.Sh SYNOPSIS
.Nm apm
.Op Fl AabHLlmPSvZz
.Op Fl f Ar sockname
.Nm zzz
.Op Fl SZz
.Op Fl f Ar sockname
.Nm ZZZ
.Op Fl SZz
.Op Fl f Ar sockname
.Sh DESCRIPTION
.Nm
communicates with the Advanced Power Management daemon,
.Xr 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,
.Nm
displays the current power management state in verbose form.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl A
Switch to automatic performance adjustment mode (the default).
.It Fl a
Display the external charger (AC) status.
0 means disconnected, 1
means connected, 2 means backup power source, and 255 means unknown.
.It Fl b
Display the battery status.
0 means high, 1 means low, 2 means
critical, 3 means charging, 4 means absent, and 255 means unknown.
.It Fl f Ar sockname
Set the name of the socket via which to contact
.Xr apmd 8
to
.Ar sockname .
.It Fl H
Switch to manual performance adjustment mode,
setting
.Va hw.setperf
to 100.
.It Fl L
Switch to manual performance adjustment mode,
setting
.Va hw.setperf
to 0.
.It Fl l
Display the estimated battery lifetime, in percent.
.It Fl m
Display the estimated battery lifetime, in minutes.
If charging, the estimated time to fully charge is displayed instead.
.It Fl P
Display the performance adjustment mode.
0 means manual mode.
1 means automatic mode.
.It Fl S
Put the system into stand-by (light sleep) state.
.It Fl v
Request more verbose description of the displayed states.
.It Fl Z
Put the system into hibernation.
System memory is saved to disk (swap space)
and the machine is powered down.
For machines supporting the
.Xr 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.
.It Fl z
Put the system into suspend (deep sleep) state.
.El
.Pp
The
.Nm zzz
and
.Nm 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
.Nm .
.Pp
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.
.Pp
Each system provides methods for waking from suspend or hibernate.
For those machines supporting
.Xr acpi 4
style suspend/resume (or hibernate/unhibernate) semantics, the wakeup
devices for each sleep state are printed during system boot in
.Xr dmesg 8 .
.Pp
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.
.Sh FILES
.Bl -tag -width /var/run/apmdev -compact
.It Pa /var/run/apmdev
The
default
.Ux Ns -domain
socket for communicating with
.Xr apmd 8 .
The
.Fl 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.
.El
.Sh SEE ALSO
.Xr apm 4 ,
.Xr apmd 8
.Pp
Advanced Power Management (APM) BIOS Interface Specification
(revision 1.2),
Intel Corporation and Microsoft Corporation
.Sh HISTORY
The
.Nm
command appeared in
.Nx 1.3 ;
.Ox
support was added in
.Ox 1.2 .