With a little spare time I've been checking what happens in logs while I
run `evtest` as per above instruction: `/var/log/dmesg` and
`/var/log/Xorg.0.log` - as grepping showed they both reference "SynPS/2
Synaptics TouchPad".
dmesg log was not updating after boot, but I noticed something in
Xorg.0
Updating BIOS managed to improve the situation to the point where I can
consistently make the touchpad work, although it is inconvenient.
Laptop: Dell XPS 13 Developer Edition (9333)
OS: 16.04 LTS - updated from 14.04 LTS - updated from 12.04 LTS, which was the
original OS and had touchpad workin