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 12, 2011 | NetBSD 9.4 |