One of the cool features in a Thinkpad is HDAPS or IBM Active Protection System as it’s called.
The system consist of two parts. The driver that enables reading the acceleration data and some sort of userspace software that does the actual parking of the harddrive heads, usually hdapsd.
The hdaps driver is part of the kernel but the driver maintainers actually recommend using the tp-smapi driver instead. So that’s what we’ll do.
Start by making sure you have the necessary tools installed
$ sudo apt-get install build-essential module-assistant
Luckily it’s in the package repository (universe)
$ sudo m-a a-i tp-smapi
this will fetch and install the tp-smapi-source package, unpack the source and then compile and install the kernel module.
Try loading it:
$ sudo modprobe tp_smapi<br /> $ sudo modprobe hdaps
The kernel log should show something like this:
[ 1546.780684] thinkpad_ec: thinkpad_ec 0.37 loaded.
[ 1546.784125] tp_smapi 0.37 loading...
[ 1546.784406] tp_smapi successfully loaded (smapi_port=0xb2).
[ 1571.445942] hdaps: LENOVO ThinkPad T61 detected, setting orientation 1
[ 1571.446111] hdaps: initial mode latch is 0x05
[ 1571.446265] hdaps: setting ec_rate=250, filter_order=2
[ 1571.446493] hdaps: device successfully initialized.
[ 1571.446607] input: ThinkPad HDAPS joystick emulation as /devices/virtual/input/input13
[ 1571.469284] input: ThinkPad HDAPS accelerometer data as /devices/virtual/input/input14
[ 1571.505138] hdaps: driver successfully loaded.
For some reason some configuration for udev is missing. Fix this by running
echo 'KERNEL=="event[0-9]*", ATTRS{phys}=="hdaps/input1",ATTRS{modalias}=="input:b0019v1014p5054e4801-*",SYMLINK+="input/hdaps/accelerometer-event"' | sudo tee /etc/udev/rules.d/51-hdaps.rules
Now for the userspace stuff. First let us test if APS is actually working.
$ sudo apt-get install hdaps-utils
After installation you can use hdaps-pivot or hdaps-gl to verify that the sensors are working
hdapsd in Jaunty is old. There is a PPA with newer version. Add the PPA to your repository list
$ cat | sudo tee /etc/apt/sources.list.d/hdapsd.list << EOF
deb http://ppa.launchpad.net/jonasped/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/jonasped/ppa/ubuntu jaunty main
EOF
And add the PPA key
$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 45EA2DEACE74152B61554DE4036A90F2BEFC6EB4
and then update the package list and install the package
$ sudo apt-get update
$ sudo apt-get install hdapsd
Remember to edit /etc/default/hdapsd to match your system.