https://bugs.freedesktop.org/show_bug.cgi?id=90528
Bug ID: 90528
Summary: Add thumb detection
Product: Wayland
Version: unspecified
Hardware: Other
OS: All
Status: ASSIGNED
Severity: normal
Priority: medium
Component: libinput
Assignee: [email protected]
Reporter: [email protected]
Blocks: 90526, 90527
For a thumb press on the T440s I get an ABS_MT_PRESSURE minimum of 100 to 110
(range [0, 255]), with the first one or sometimes two events being in the
80-100 range. Finger data is in the 60-90 range.
On an X220t, the thumb pressure is all over the place. This touchpad is quite
small, so the only way to use a thumb here is to only partially touch the
touchpad, so most thumb presses are actually in the 30-60 range.
Finger data is in the 50-90 range.
Based on those two touchpads: what may work is having a zone on the touchpad,
similar to touchpad buttons to label a thumb (or at least increase confidence
that it is a thumb).
We may need to limit thumb detection to certain touchpads over a specific size.
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