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Edited because of escaping errors:

I am running a dev. build of Ubuntu 18.10 with libinput10 version 1.12.0-1. It has a quirks file called 50-system-dell.quirks. This contains the following section:

[Dell XPS L322X Touchpad]
MatchName=*CyPS/2 Cypress Trackpad
MatchDMIModalias=dmi:*svnDell*:XPSL322X*
AttrPressureRange=30:15
AttrPalmPressureThreshold=130

The numbers for the pressure range and palm-pressure threshold may be different but I changed them and did not keep the original file...

First problem: The MatchDMIModalias-line is wrong because it does not match the actual device. After changing that line to

MatchDMIModalias=dmi:*svnDell*:*pnXPSL322X*

it does match. But, second problem:

The values are wrong and make the touchpad close to unusable, just like the problems we had with

https://bugs.freedesktop.org/show_bug.cgi?id=104990

After changing the last two lines to:

AttrPressureRange=85:40
AttrPalmPressureThreshold=230

the touchpad works fine for some time. But after some scrolling around (two minutes or so) in Chromium or Nautilus there is a crash and Gnome Shell shuts down forcing a new login. This problems is persistent and occurs with different applications.

I managed to solve this by completely removing the setting for AttrPressureRange. Since the palm-pressure threshold is most wrong this makes the device usable but I still think this is a bug.

I attached the quirks file that produces the bug on my system.

50-system-dell.quirks