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APS(4)                DragonFly Kernel Interfaces Manual                APS(4)


aps -- ThinkPad Active Protection System accelerometer


To compile this driver into the kernel, place the following lines in your kernel configuration file: device isa device aps0 at isa? port 0x1600 Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): aps_load="YES"


The aps driver provides support for several sensors found in some ThinkPad laptops. The sensors currently supported are: Sensor Units Typical Use X_ACCEL Unknown X Acceleration Y_ACCEL Unknown Y Acceleration X_VAR Unknown Weighted X Acceleration? Y_VAR Unknown Weighted Y Acceleration? Temp1 uK Unknown Temp2 uK Unknown Keyboard Active boolean Keyboard activity Mouse Active boolean Mouse activity Lid Open boolean Lid state Sensor values are made available through the HW_SENSORS sysctl(3) inter- face, and can be monitored with the systat(1) sensors display, sensorsd(8) and sysctl(8) hw.sensors. For example, on a ThinkPad R51: %sysctl hw.sensors.aps0 hw.sensors.aps0.raw0: 488 (X_ACCEL) hw.sensors.aps0.raw1: 481 (Y_ACCEL) hw.sensors.aps0.raw2: 488 (X_VAR) hw.sensors.aps0.raw3: 481 (Y_VAR) hw.sensors.aps0.temp0: 52.00 degC hw.sensors.aps0.temp1: 52.00 degC hw.sensors.aps0.indicator0: Off (Keyboard Active) hw.sensors.aps0.indicator1: Off (Mouse Active) hw.sensors.aps0.indicator2: On (Lid Open)


systat(1), sysctl(3), intro(4), isa(4), sensorsd(8), sysctl(8)


The aps driver first appeared in OpenBSD 3.8. DragonFly support was added in DragonFly 2.5.


The aps driver was written by Jonathan Gray <jsg@openbsd.org>. It was adapted to DragonFly by Constantine A. Murenin, University of Waterloo.


The aps driver does not yet maintain state and subsequently does not take evasive action when it thinks the hard drive is in danger. The Y axis on X40 and possibly other models seems to be inverted. It is unknown how to distinguish between different versions of the accelerome- ter to compensate for this in the driver at this time. As IBM provides no documentation, it is not known what all the available sensors are used for. DragonFly 3.5 March 18, 2010 DragonFly 3.5

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