Dell Precision 3540: Hard to create three finger pinch
libinput 1.16.4
On the Dell Precision 3540 three finger pinch events, needed for GNOME Shell gestures, are hard to create.
[ 14.067410] input: DELL08BA:00 0488:121F Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-6/i2c-DELL08BA:00/0018:0488:121F.0001/input/input12
[ 14.328729] input: DELL08BA:00 0488:121F Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-6/i2c-DELL08BA:00/0018:0488:121F.0001/input/input15
Swiping events are much easier to create. The libinput debug log shows my attempts, where I think I did the same movement, but often only swipe events were generated.