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NetBSD 6.1.5 - man page for aps (netbsd section 4)

APS(4)				   BSD Kernel Interfaces Manual 			   APS(4)

     aps -- ThinkPad 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 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

     envsys(4), hpacel(4), thinkpad(4), envstat(8)

     The aps driver first appeared in OpenBSD 3.8 and was then ported to NetBSD 5.0.

     The aps driver was written by Jonathan Gray <jsg@openbsd.org>.

     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.  Possible 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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