I have run into issues with ThinkPad TrackPoints in Linux. Specifically, there doesn’t seem to be a straight-forward way to change some of the settings permanently.
I’ve tried configuring it at startup with scripts that wait for the
sensitivity file to show up in /sys/bus/serio/devices/serio2/ and then echo
250 to that file. Unfortunately, this is fairly error-prone (the path can
change) and is a bit of a hack.
Another thing I’ve tried is to just run xinput when I finally get to my
desktop interface and configure it that way. Unfortunately, this requires a)
that I be running X (I use Wayland), and b) that I do it interactively (it never
seemed to work for me as a login item).
Fortunately, I’ve found configuring it through udev is actually much simpler
than I though it would be. Create /etc/udev/rules.d/10-trackpoint.rules with
the following:
ACTION=="add", SUBSYSTEM=="input",
ATTR{name}=="TPPS/2 IBM TrackPoint",
ATTR{device/sensitivity}="200"
After creating/editing this file, you can make the changes to into effect by telling udev about them:
udevadm control --reload-rules
udevadm trigger
This method allows you to configure any of the settings found in
/sys/bus/serio/devices/serio2/ (or equivalent) by simply adding another
comma-separated statement like ATTR{device/speed}.
Enjoy a permanent, stable configuration of your TrackPoint.