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

     apm, zzz — control the APM BIOS and display its information

     apm [-ablstzZ] [-d enable] [-e enable] [-h enable] [-r delta]


     The apm utility controls the Intel / Microsoft APM (Advanced Power
     Management) BIOS and displays the current status of APM on laptop PCs.  The
     zzz utility suspends the system by controlling APM.

     The following options are available for apm (no options are available for
     zzz).  If no options are specified, apm displays information and current
     status of APM in verbose mode.  If multiple display options are given, the
     values are displayed one per line in the order given here.

     -a      Display the current AC-line status as an integer value.  The values
             0 and 1 correspond to the “off-line” state or “on-line” state,

     -b      Display an integer value reflecting the current battery status.
             The values 0, 1, 2, 3, correspond to the “high” status, “low”
             status, “critical” status, “charging” status respectively.

     -d enable
             Disable/enable suspending of the display separately from a normal
             suspend using the boolean value for enable.  This feature seems to
             not work on many different laptops, including the Libretto 30CT and

     -e enable
             Enable or disable APM functions of the computer, depending on the
             boolean enable argument.

     -h enable
             Depending on the boolean value of enable, enable or disable the HLT
             instruction in the kernel context switch routine.  These options
             are not necessary for almost all APM implementations, but for some
             implementations whose “Idle CPU” call executes both CPU clock
             slowdown and HLT instruction, -h false is necessary to prevent the
             system from reducing its peak performance.  See apm(4) for details.

     -l      Display the remaining battery percentage.  If your laptop does not
             support this function, 255 is displayed.

     -r delta
             Enable the resume wakeup timer, if the laptop supports it.  This
             doesn't actually suspend the laptop, but if the laptop is
             suspended, and it supports resume from suspend, then it will be
             resumed after delta seconds (from when you run this command, not
             from when you suspend).

     -s      Display the status of the APM support as an integer value.  The
             values 0 and 1 correspond to the “disabled” state or “enabled”
             state respectively.

     -t      Display the estimated remaining battery lifetime in seconds.  If it
             is unknown, -1 is displayed.

     -Z      Transition the system into standby mode.  This mode uses less power
             than full power mode, but more than suspend mode.  Some laptops
             support resuming from this state on timer or Ring Indicator events.
             The output of apm tells what your laptop claims to support.

     -z      Suspend the system.  It is equivalent to zzz.

     Some APM implementations do not support parameters needed by apm.  On such
     systems, apm displays them as unknown.

     Some APM implementations cannot handle events such as pushing the power
     button or closing the cover.  On such implementations, the system must be
     suspended only by using apm or zzz.

     apmconf(8) has been merged in apm and thus apm replaces all of its


     Tatsumi Hosokawa <hosokawa@jp.FreeBSD.org>

BSD                             November 1, 1994                             BSD