touchpad too sensitive on slow movements

[Sebouh Aguehian]

This is an aftermarket touchpad for a thinkpad T440s. The problem is when I touch it with my finger and then remove my finger without moving (so press->release), the touchpad registers a movement, usually downward. This is probably due to my finger tip changing from pressed to round as I remove it, and the bottom part of it loses contact with the touchpad last. I don't have this sort of problem with synaptics because this minor movement doesn't affect the cursor. With libinput, it is too sensitive on slow movements.

Similarly, moving the cursor works fine but after I stop and remove by finger the cursor usually ends up off target.

Device: AlpsPS/2 ALPS DualPoint TouchPad
Kernel: /dev/input/event7
Group: 7
Seat: seat0, default
Size: 97.50x53.87mm
Capabilities: pointer
Tap-to-click: disabled
Tap-and-drag: enabled
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: n/a
Calibration: n/a
Scroll methods: *two-finger edge
Click methods: *button-areas clickfinger
Disable-w-typing: enabled
Accel profiles: none

Current config:
Device 'AlpsPS/2 ALPS DualPoint TouchPad':
 Device Enabled (139): 1
 Coordinate Transformation Matrix (141): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
 libinput Tapping Enabled (290): 1
 libinput Tapping Enabled Default (291): 0
 libinput Tapping Drag Enabled (292): 1
 libinput Tapping Drag Enabled Default (293): 1
 libinput Tapping Drag Lock Enabled (294): 0
 libinput Tapping Drag Lock Enabled Default (295): 0
 libinput Accel Speed (273): 0.000000
 libinput Accel Speed Default (274): 0.000000
 libinput Natural Scrolling Enabled (278): 1
 libinput Natural Scrolling Enabled Default (279): 0
 libinput Send Events Modes Available (257): 1, 1
 libinput Send Events Mode Enabled (258): 0, 0
 libinput Send Events Mode Enabled Default (259): 0, 0
 libinput Left Handed Enabled (280): 0
 libinput Left Handed Enabled Default (281): 0
 libinput Scroll Methods Available (282): 1, 1, 0
 libinput Scroll Method Enabled (283): 1, 0, 0
 libinput Scroll Method Enabled Default (284): 1, 0, 0
 libinput Click Methods Available (296): 1, 1
 libinput Click Method Enabled (297): 1, 0
 libinput Click Method Enabled Default (298): 1, 0
 libinput Disable While Typing Enabled (299): 1
 libinput Disable While Typing Enabled Default (300): 1
 Device Node (260): "/dev/input/event7"
 Device Product ID (261): 2, 8
 libinput Drag Lock Buttons (289): <no items>
 libinput Horizonal Scroll Enabled (262): 1

[Sebouh Aguehian (sebouh00)]

I'm not sure if this is a duplicate. The issue I've described has to do with sensitivity to slow/short movements, not jitters or jerky movement. I've went ahead and opened a bug report on libinput: https://bugs.freedesktop.org/show_bug.cgi?id=97819