I just found a kind of hardware solution to this problem. There's a touchpad
configuration flag named "absolute position filtering" which roughens the
position reporting.
Accessing that configuration is a bit tricky, but there's a code in fwupd
project which demonstrates how it's done.
I created a "proof of concept" script which changes the flag.
https://raw.githubusercontent.com/KIrill-ka/x230-touchpad-scripts/master/x230-abs-filter-disable.tcl
Run as root. It's rather safe, trust me :)
Despite of the name, the script works on x220. The hardware is the same.
The configuration stays there until the next reboot (or suspend).
It should be possible to store the configuration permanently in the touchpad's
flash. But it requires more work.
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https://bugs.launchpad.net/bugs/1042069
Title:
Jumpy Mouse Cursor using Thinkpad X230 Touchpad
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