zlacker

I had the following - and luckily they worked great under Linux (Ubuntu LTS or Lubuntu):

Lenovo ThinkPad x61s Lenovo ThinkPad x220 Lenovo ThinkPad x230 Lenovo ThinkPad Lenovo ThinkPad x1 DELL Latitude E7450 and similar

Problematic:

Lenovo ThinkPad x240 - hypersensitive touchpad makes mouse pointer jumpt while writing text