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NetBSD 6.1.5 - man page for aibs (netbsd section 4)

AIBS(4) 			   BSD Kernel Interfaces Manual 			  AIBS(4)

NAME
     aibs -- ASUSTeK AI Booster voltage, temperature, and fan sensor

SYNOPSIS
     aibs* at acpi?

DESCRIPTION
     The 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:

     o	 Voltage sensors can have a state of 'valid', 'critunder', or 'critover'; temperature
	 sensors can have a state of 'valid', 'warnover', 'critover', or 'invalid'; and fan sen-
	 sors can have a state of 'valid', 'warnunder', or 'warnover'.

     o	 Temperature sensors that have a reading of 0 are marked 'invalid', whereas all other
	 sensors are always assumed valid.

     o	 Voltage sensors have a lower and an upper limit, 'critunder' and 'critover', temperature
	 sensors have two upper limits, 'warnover' and 'critover', whereas fan sensors may either
	 have only the lower limit 'warnunder', or, depending on the vendor's ACPI implementa-
	 tion, one lower and one upper limit, 'warnunder' and 'warnover'.

     Sensor values and limits are made available through the envsys(4) interface, and can be mon-
     itored 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:

     o	 Sensor values from 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 pro-
	 vided 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.

     o	 Sensor descriptions from aibs are more likely to match the markings on the motherboard.

     o	 Sensor states are supported by 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.

     o	 Support for newer chips in 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 redun-
     dant 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 pres-
     ence 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.

SEE ALSO
     acpi(4), envsys(4), envstat(8)

HISTORY
     The 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.

AUTHORS
     The 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 Sci-
     ence, 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.

BSD					  June 12, 2011 				      BSD


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