BATTERY_PMU(4) BSD Kernel Interfaces Manual BATTERY_PMU(4)NAME
battery_pmu -- support for batteries and sensors in PCI-based Apple Powerbooks
SYNOPSIS
battery* at pmu?
DESCRIPTION
The battery_pmu driver provides support for batteries and hardware sensors found in first generation PCI-based PowerBooks (i.e. Apple Power-
book 2400, 3400 and 3500 (also known as Original PowerBook G3). Currently it only exports a few sensors via the envsys(4) interface, includ-
ing battery charge, voltage, CPU and battery temperature and AC power availability.
SEE ALSO envsys(4), pmu(4), envstat(8)BUGS
There is no APM emulation right now and the battery current sensor may return misleading or wrong data. This driver is considered prelimi-
nary and may be replaced at some point.
BSD May 18, 2009 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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