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apm (4)
  • apm (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • apm (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • >> apm (4) ( FreeBSD man: Специальные файлы /dev/* )
  • apm (4) ( Русские man: Специальные файлы /dev/* )
  • apm (4) ( Linux man: Специальные файлы /dev/* )
  • apm (8) ( FreeBSD man: Команды системного администрирования )
  • apm (8) ( Русские man: Команды системного администрирования )
  • Ключ apm обнаружен в базе ключевых слов.

  • BSD mandoc
     

    NAME

    
    
    apm
    
     - APM BIOS interface
    
     
    

    SYNOPSIS

    device apm  

    DESCRIPTION

    is an interface to the Intel / Microsoft APM (Advanced Power Management) BIOS on laptop PCs.

    provides the following power management functions.

    1. When the system wakes up from suspended mode, adjusts the system clock to RTC.
    2. When the system wakes up from suspended mode, passes a message to syslogd(8) comprising of system wakeup time and elapsed time during suspended mode.
    3. slows CPU clock when there are no system activities (runnable processes, interrupts, etc.). This function is available only on systems whose APM supports CPU idling.
    4. exports an application interface as a character device. Applications can control APM, or retrieve APM status information via this interface. exports the following interfaces. These symbols are defined in In machine/apm_bios.h .

      APMIO_SUSPEND
      Suspend system.
      APMIO_GET
      Get power management information.
      APMIO_ENABLE
      APMIO_DISABLE
      Enable / Disable power management.
      APMIO_HALTCPU
      APMIO_NOTHALTCPU
      Control execution of HLT in the kernel context switch routine.
      APMIO_GETPWSTATUS
      Get per battery information.

      Some APM implementations execute the HLT (Halt CPU until an interrupt occurs) instruction in the ``Idle CPU '' call, while others do not. Thus enabling this may result in redundant HLT executions because ``Idle CPU '' is called from the kernel context switch routine that inherently executes HLT. This may reduce peak system performance.

      Also the system hangs up if HLT instruction is disabled in the kernel context switch routine, and if the APM implementation of the machine does not execute HLT in ``Idle CPU '' On some implementations that do not support CPU clock slowdown, APM might not execute HLT. disables APMIO_NOTHALTCPU operation on such machines.

      The current version of does not call ``Idle CPU '' from the kernel context switch routine if clock slowdown is not supported, and it executes HLT instruction by default. Therefore, there is no need to use these two operations in most cases.

      These interfaces are used by apm(8).

    5. polls APM events and handles the following events.

      Name Action Description
      PMEV_STANDBYREQ suspend system standby request
      PMEV_SUSPENDREQ suspend system suspend request
      PMEV_USERSUSPENDREQ suspend system user suspend request
      PMEV_CRITSUSPEND suspend system critical suspend request
      PMEV_NORMRESUME resume system normal resume
      PMEV_CRITRESUME resume system critical resume
      PMEV_STANDBYRESUME resume system standby resume
      PMEV_BATTERYLOW notify message battery low
      PMEV_UPDATETIME adjust clock update time

     

    SEE ALSO

    apm(8), zzz(8)  

    AUTHORS

    Tatsumi Hosokawa <hosokawa@jp.FreeBSD.org>  

    BUGS

    WARNING! Many, if not most, of the implementations of APM-bios in laptops today are buggy. You may be putting your LCD-display and batteries at a risk by using this interface. (The reason this is not a problem for MS-Windows is that they use the real-mode interface.) If you see any weird behavior from your system with this code in use, unplug the power and batteries ASAP, if not immediately, and disable this code.

    We are very interested in getting this code working, so please send your observations of any anomalous behavior to us.

    When is active, calling the BIOS setup routine by using hot-keys, may cause serious trouble when resuming the system. BIOS setup programs should be called during bootstrap, or from DOS.

    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(8) or zzz(8).

    Disk spin-down, LCD backlight control, and power on demand have not been supported on the current version.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    SEE ALSO
    AUTHORS
    BUGS


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