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



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


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


      Apm controls the Intel / Microsoft APM (Advanced Power Management) BIOS
      and displays the current status of APM on laptop PCs.  Zzz 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 val‐
              ues 0 and 1 correspond to the “off-line” state or “on-line”
              state, respectively.
      -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 50CT.
      -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, -t is necessary to prevent
              the system from reducing its peak performance.  See apm(4) for
      -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 sus‐
              pended, 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 Indica‐
              tor events.  The output of apm tells what your laptop claims to
      -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(8) and thus apm(8) replaces all of its


      Tatsumi Hosokawa 〈〉


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.

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