man/man4/aibs.4

.\"	$OpenBSD: aibs.4,v 1.4 2009/07/30 06:30:45 jmc Exp $
.\"
.\" Copyright (c) 2009 Constantine A. Murenin <cnst+dfly@bugmail.mojo.ru>
.\"
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd February 9, 2010
.Dt AIBS 4
.Os
.Sh NAME
.Nm aibs
.Nd "ASUSTeK AI Booster ACPI ATK0110 voltage, temperature and fan sensor"
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device acpi"
.Cd "device aibs"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following lines in
.Xr loader.conf 5 :
.Bd -literal -offset indent
acpi_load="YES"
aibs_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for the voltage, temperature and fan sensors
available through the
.Tn ATK0110
.Tn ASOC
.Tn ACPI
device
on
.Tn ASUSTeK
motherboards.
The number of sensors of each type,
as well as the description of each sensor,
varies according to the motherboard.
.Pp
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
.Tn ACPI .
.Pp
The
.Nm
driver supports sensor states as follows:
.Bl -bullet
.It
Temperature sensors can have a state of
.Dv OK ,
.Dv WARN ,
.Dv CRIT
or
.Dv UNKNOWN ;
fan and voltage sensors can have a state of
.Dv OK
or
.Dv WARN
only.
.It
Temperature sensors that have a reading of 0
are marked
.Dv invalid
and their state is set to
.Dv UNKNOWN ,
whereas all other sensors are always assumed valid.
.It
Temperature sensors have two upper limits
.Dv ( WARN
and
.Dv CRIT ) ,
fan sensors may have either only the lower limit,
or, depending on the
.Tn DSDT ,
one lower and one upper limit,
and voltage sensors always have a lower and an upper limit.
.El
.Pp
Sensor values are made available through the
.Dv HW_SENSORS
.Xr sysctl 3
interface,
and can be monitored with the
.Xr systat 1
.Ar sensors
display,
.Xr sensorsd 8
and
.Xr sysctl 8
.Ar hw.sensors .
For example, on an Asus Stricker Extreme motherboard:
.Bd -literal -offset indent
$ sysctl hw.sensors.aibs0
hw.sensors.aibs0.temp0=31.00 degC (CPU Temperature), OK
hw.sensors.aibs0.temp1=43.00 degC (MB Temperature), OK
hw.sensors.aibs0.fan0=2490 RPM (CPU FAN Speed), OK
hw.sensors.aibs0.fan1=0 RPM (CHASSIS FAN Speed), WARNING
hw.sensors.aibs0.fan2=0 RPM (OPT1 FAN Speed), WARNING
hw.sensors.aibs0.fan3=0 RPM (OPT2 FAN Speed), WARNING
hw.sensors.aibs0.fan4=0 RPM (OPT3 FAN Speed), WARNING
hw.sensors.aibs0.fan5=0 RPM (OPT4 FAN Speed), WARNING
hw.sensors.aibs0.fan6=0 RPM (OPT5 FAN Speed), WARNING
hw.sensors.aibs0.fan7=0 RPM (PWR FAN Speed), WARNING
hw.sensors.aibs0.volt0=1.26 VDC (Vcore Voltage), OK
hw.sensors.aibs0.volt1=3.25 VDC ( +3.3 Voltage), OK
hw.sensors.aibs0.volt2=4.95 VDC ( +5.0 Voltage), OK
hw.sensors.aibs0.volt3=11.78 VDC (+12.0 Voltage), OK
hw.sensors.aibs0.volt4=1.23 VDC (1.2VHT Voltage), OK
hw.sensors.aibs0.volt5=1.50 VDC (SB CORE Voltage), OK
hw.sensors.aibs0.volt6=1.25 VDC (CPU VTT Voltage), OK
hw.sensors.aibs0.volt7=0.93 VDC (DDR2 TERM Voltage), OK
hw.sensors.aibs0.volt8=1.23 VDC (NB CORE Voltage), OK
hw.sensors.aibs0.volt9=1.87 VDC (MEMORY Voltage), OK
.Ed
.Pp
Generally, sensors provided by the
.Nm
driver may also be supported by a variety of other drivers,
such as
.Xr lm 4
or
.Xr it 4 .
The precise collection of
.Nm
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.
.Pp
The
.Nm
driver, however, provides the following advantages
when compared to the native hardware monitoring drivers:
.Bl -bullet
.It
Sensor values from
.Nm
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
.Nm ,
the required resistor factors are provided by
the motherboard manufacturer through
.Tn 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
.Nm
are very likely to be identical to the readings from the
Hardware Monitor screen in the BIOS.
.It
Sensor descriptions from
.Nm
are more likely to match the markings on the motherboard.
.It
Sensor status is supported by
.Nm .
The status 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.
.It
Support for newer chips in
.Nm .
Newer chips may miss a native driver,
but should be supported through
.Nm
regardless.
.El
.Pp
As a result, sensor readings from the actual
native hardware monitoring drivers
are redundant when
.Nm
is present, and
may be ignored as appropriate.
Whereas on
.Ox
the native drivers have to be specifically disabled should
their presence be judged unnecessary,
on
.Dx
the
.Xr lm 4
and
.Xr it 4
are not probed provided that
.Xr acpi 4
is configured and the system potentially supports
the hardware monitoring chip through
.Tn ACPI .
.Sh SEE ALSO
.Xr systat 1 ,
.Xr sysctl 3 ,
.Xr acpi 4 ,
.Xr intro 4 ,
.Xr sensorsd 8 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 4.7
and
.Dx 2.5 .
.Sh AUTHORS
The
.Nm
driver was written for
.Ox
and
.Dx
by
.An Constantine A. Murenin Aq Lk http://cnst.su/ ,
Raouf Boutaba Research Group,
David R. Cheriton School of Computer Science,
University of Waterloo.