AMDTEMP(4) BSD Kernel Interfaces Manual AMDTEMP(4)NAME
amdtemp -- AMD CPU on-die digital thermal sensor
SYNOPSIS
amdtemp* at pchb?
DESCRIPTION
The amdtemp driver provides support for the on-die digital thermal sensor present on AMD K8, AMD Barcelona, AMD Phenom, AMD Griffin, and AMD
Fusion CPUs.
These sensors were officially introduced in AMD K8 Revision F processors, and provide 0.5 degC accuracy. Precision was improved in Revision
G chips, which provide two more bits for 0.25 degC steppings. Each core has two temperature sensors, and there are up to two cores per CPU
socket.
AMD Barcelona, AMD Phenom, AMD Griffin, and AMD Fusion provide 0.125 degC accuracy and provide one temperature sensor for each CPU socket.
The amdtemp driver reports temperatures through the envsys(4) API.
Sensor Units Typical Use
CPUN sensor0 uK cpuN temperature
SEE ALSO envsys(4), envstat(8), powerd(8)HISTORY
The amdtemp driver first appeared in OpenBSD 4.4 named ``kate''. It was then ported to NetBSD 5.0. The driver has been renamed with support
for newer AMD CPUs.
AUTHORS
The amdtemp driver was written by Constantine A. Murenin <cnst@openbsd.org> whilst at the University of Waterloo. It was adapted to NetBSD
by Christoph Egger.
BSD March 2, 2012 BSD
Check Out this Related Man Page
APS(4) BSD Kernel Interfaces Manual APS(4)NAME
aps -- ThinkPad Active Protection System accelerometer
SYNOPSIS
aps0 at isa? port 0x1600
DESCRIPTION
The aps driver provides support for several sensors found in some ThinkPad laptops.
The sensors currently exposed via the envsys(4) interface are:
Sensor Units Typical Use
x-acceleration integer X-axis acceleration
y-acceleration integer Y-axis acceleration
x-variable integer Weighted X acceleration?
y-variable integer Weighted Y acceleration?
temperature 1 degC Unknown temperature
temperature 2 degC Unknown temperature
keyboard active boolean Keyboard activity
mouse active boolean Mouse activity
lid open boolean Lid state
SEE ALSO envsys(4), hpacel(4), thinkpad(4), envstat(8)HISTORY
The aps driver first appeared in OpenBSD 3.8 and was then ported to NetBSD 5.0.
AUTHORS
The aps driver was written by Jonathan Gray <jsg@openbsd.org>.
CAVEATS
Few issues can be mentioned.
o The aps driver does not maintain state and subsequently does not take evasive action when it thinks the hard drive is in danger. Possi-
ble actions would include spinning down the hard drive in case excessive tremor is detected by the sensors.
o The Y axis on X40 and possibly other models seems to be inverted. It is unknown how to distinguish between different versions of the
accelerometer to compensate for this in the driver at this time.
o The sensor values are refreshed every 0.5 seconds. Because no protection measures are taken, this is unnecessary and may have a negative
effect on battery life.
o As IBM provides no documentation, it is not known what all the available sensors are used for.
BSD July 13, 2011 BSD
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