OpenBSD manual page server

Manual Page Search Parameters

APS(4) Device Drivers Manual APS(4)

apsThinkPad Active Protection System accelerometer

aps0 at isa? port 0x1600

The aps driver provides support for several sensors found in some ThinkPad laptops.

The sensors currently exposed via the sysctl(8) interface are:

Unknown X Acceleration
Unknown Y Acceleration
Unknown Weighted X Acceleration?
Unknown Weighted Y Acceleration?
uK Unknown
uK Unknown
boolean Keyboard activity
boolean Mouse activity
boolean Lid state

isa(4), sensorsd(8), sysctl(8)

The aps driver first appeared in OpenBSD 3.8.

The aps driver was written by Jonathan Gray <>.

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 accelerometer 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.

July 16, 2013 OpenBSD-5.5