Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   9087 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

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.

     ·	 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.

     ·	 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.

     ·	 The sensor values are refreshed every 0.5 seconds.  Because no pro‐
	 tection measures are taken, this is unnecessary and may have a nega‐
	 tive effect on battery life.

     ·	 As IBM provides no documentation, it is not known what all the avail‐
	 able sensors are used for.

BSD				 July 13, 2011				   BSD

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 

Vote for polarhome