| AIBS(4) | Device Drivers Manual | AIBS(4) | 
aibs —
aibs* at acpi?
aibs driver provides support for voltage,
  temperature, and fan sensors available as an ACPI device on ASUSTeK
  motherboards. The number of sensors of each type, as well as the description
  of each sensor, varies according to the motherboard.
The driver supports an arbitrary set of sensors, provides descriptions regarding what each sensor is used for, and reports whether each sensor is within the specifications as defined by the motherboard manufacturer through ACPI.
The aibs driver supports
    envsys(4) sensor states as
    follows:
Sensor values and limits are made available through the envsys(4) interface, and can be monitored with envstat(8). For example, on an ASUS V3-P5G965 barebone:
$ envstat -d aibs0
                     Current  CritMax  WarnMax  WarnMin  CritMin Unit
    Vcore Voltage:     1.152    1.600                      0.850    V
     +3.3 Voltage:     3.312    3.630                      2.970    V
       +5 Voltage:     5.017    5.500                      4.500    V
      +12 Voltage:    12.302   13.800                     10.200    V
  CPU Temperature:    27.000   95.000   80.000                   degC
   MB Temperature:    58.000   95.000   60.000                   degC
    CPU FAN Speed:       878              7200      600           RPM
CHASSIS FAN Speed:         0              7200      700           RPM
Generally, sensors provided by the aibs
    driver may also be supported by a variety of other drivers, such as
    lm(4) or
    itesio(4). The precise
    collection of aibs sensors is comprised of the
    sensors specifically utilised in the motherboard design, which may be
    supported through a combination of one or more physical hardware monitoring
    chips.
The aibs driver, however, provides the
    following advantages when compared to the native hardware monitoring
    drivers:
aibs are expected to be more
      reliable. For example, voltage sensors in many hardware monitoring chips
      can only sense voltage from 0 to 2 or 4 volts, and the excessive voltage
      is removed by the resistors, which may vary with the motherboard and with
      the voltage that is being sensed. In aibs, the
      required resistor factors are provided by the motherboard manufacturer
      through ACPI; in the native drivers, the resistor factors are encoded into
      the driver based on the chip manufacturer's recommendations. In essence,
      sensor values from aibs are very likely to be
      identical to the readings from the Hardware Monitor screen in the
    BIOS.aibs are more likely to
      match the markings on the motherboard.aibs. The state is
      reported based on the acceptable range of values for each individual
      sensor as suggested by the motherboard manufacturer. For example, the
      threshold for the CPU temperature sensor is likely to be significantly
      higher than that for the chassis temperature sensor.aibs. Newer chips may
      miss a native driver, but should be supported through
      aibs regardless.As a result, sensor readings from the actual native hardware
    monitoring drivers are redundant when aibs is
    present, and may be ignored as appropriate. Whereas on some supported
    operating systems the native drivers may have to be specifically disabled
    should their presence be judged unnecessary, on others the drivers like
    lm(4) are not probed provided that
    acpi(4) is configured and the
    system potentially supports the hardware monitoring chip through ACPI.
aibs driver first appeared in
  OpenBSD 4.7, DragonFly 2.4.1
  and NetBSD 6.0. An earlier version of the driver,
  named aiboost, first appeared in
  FreeBSD 7.0 and NetBSD 5.0.
aibs driver was written for
  OpenBSD, DragonFly BSD, and
  NetBSD by Constantine A.
  Murenin
  ⟨http://cnst.su/⟩,
  Raouf Boutaba Research Group, David R. Cheriton School of Computer Science,
  University of Waterloo. Jukka Ruohonen
  ⟨jruohonen@iki.fi⟩ later reworked and adjusted the driver to
  support new ASUSTeK motherboards. The earlier version of the driver,
  aiboost, was written for
  FreeBSD by Takanori Watanabe
  and adapted to NetBSD by Juan Romero
  Pardines.
| June 8, 2020 | NetBSD 10.1 |