ThinkPad USB Keyboard with TrackPoint

A Thinkpad keyboard minus the Thinkpad with the classic Trackpoint + Left/Middle/Right mouse buttons. Its attached to my Stretchbook and I want to change the behaviour of a few keys.

Let's go!

Attach the keyboard ...

$ lsusb | grep -i keyboard
Bus 001 Device 002: ID 17ef:6009 Lenovo ThinkPad Keyboard with TrackPoint

0. Caps_Lock and xmodmap

Caps_Lock occupies a prime location and - seeing as I do not carry on many ALL CAPS conversations - the key can be re-purposed for better use. I use xmodmap to modify the keymap and transform the key into BackSpace.

Retrieve current keymap (and the keycode for Caps_Lock) ...

$ xmodmap -pke
[...]
keycode  66 = Caps_Lock NoSymbol Caps_Lock
[...]

Output for Caps_Lock using xev ...

KeyPress event, serial 32, synthetic NO, window 0x1600001,
    root 0xb4, subw 0x0, time 578277182, (137,-6), root:(781,12),
    state 0x0, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
     XFilterEvent returns: False

Test a new key modification in the current Xsession ...

$ xmodmap -e "keycode 66 = BackSpace" && xmodmap -e "clear Lock"

Make the change sticky by adding the keymapping to ~/.xmodmap ...

! Modify Caps_Lock into Backspace
keycode 66 = BackSpace
clear Lock

Modify ~/.xinitrc to load keymap at startx ...

if [ -f ~/.xmodmap ]; then
    xmodmap ~/.xmodmap
fi

... and apply the new settings in the current session ..

xmodmap ~/.xmodmap

1. Multimedia keys and xbindkeys

This keyboard includes multimedia keys. Create keyboard shortcuts for these specialty keys by installing ...

  • xbindkeys - associate keys to shell commands
  • pulseaudio-utils - manage sound with pactl
  • rhythmbox-plugins - (optional) player controls
$ sudo apt install xbindkeys pulseaudio-utils rhythmbox-plugins

With rhythmbox-plugins the Fn+{Play,Pause,Previous,Next,Stop} controls "just work" with the audio player. I use xbindkeys to associate new functions to keys.

Retrieve the keycodes and keysyms of the volume keys ...

$ xmodmap -pke | egrep -i 'volume|mute'
keycode 121 = XF86AudioMute NoSymbol XF86AudioMute
keycode 122 = XF86AudioLowerVolume NoSymbol XF86AudioLowerVolume
keycode 123 = XF86AudioRaiseVolume NoSymbol XF86AudioRaiseVolume
keycode 198 = XF86AudioMicMute NoSymbol XF86AudioMicMute

I create a standalone script to control PulseAudio volume and associate the new command paVolume and its options to volume keys in ~/.xbindkeysrc ...

# Mute/lower/raise volume
"paVolume -m"
XF86AudioMute
"paVolume -d"
XF86AudioLowerVolume
"paVolume -u"
XF86AudioRaiseVolume

Add command xbindkeys to ~/.xinitrc to load the new configuration at startx ...

if [ -f ~/.xbindkeysrc ]; then
    xbindkeys
fi

2. TrackPoint

Customize pointer settings by installing xinput ...

$ sudo apt install xinput

Discover the DEVICE <ID> with xinput list | grep "TrackPoint" | grep "pointer" ...

$ xinput list | grep "TrackPoint" | grep "pointer"
⎜   ↳ Lite-On Technology Corp. ThinkPad USB Keyboard with TrackPoint    id=13   [slave  pointer  (2)]

Trackpoint is auto-detected but slow. My old method of configuring the pointer was failing under Debian _stable_/stretch (device id=13) ...

$ xinput set-prop 13 "Device Accel Constant Deceleration" 0.30
property 'Device Accel Constant Deceleration' doesn't exist, you need to specify its type and format

... and viewing the device properties with xinput list-props 13 shows the problem; the old Device... settings have been replaced with libinput..., which is a library to handle input devices. Xorg in the latest Debian has switched away from using evdev to the libinput driver ...

$ dpkg -l | grep xserver-xorg-input
[...]
ii  xserver-xorg-input-libinput     0.23.0-2    amd64   X.Org X server -- libinput input driver

Check out which devices are managed by libinput ...

$ grep libinput $HOME/.local/share/xorg/Xorg.0.log

[ Fix! ] Modify the "Coordinate Transformation Matrix", a transformation matrix used to calculate a pointer movement.

Current setting ...

$ xinput list-props 13 | grep "Coordinate Transformation Matrix"
Coordinate Transformation Matrix (140): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000

Experiment a bit with setting a new matrix in row-order. [1] I wanted a faster pointer speed and found this configuration to my liking ...

$ xinput set-prop 13 "Coordinate Transformation Matrix" 2.600000, 0.000000, 0.000000, 0.000000, 2.600000, 0.000000, 0.000000, 0.000000, 1.000000

I created a shell script that detects and applies custom settings as per keyboard type. I add the command to my xinitrc to be run at startx ...

~/bin/keyboardconf &

Sources: dotfiles/.xmodmap.thinkpad_usb, dotfiles/.xinitrc, dotfiles/.xbindkeysrc.thinkpad_usb, and homebin/keyboardconf

Happy hacking!

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