[Wayland-bugs] [Bug 99355] Use pressure, not just BTN_TOUCH for touch point detection on touchpads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99355

            Bug ID: 99355
           Summary: Use pressure, not just BTN_TOUCH for touch point
                    detection on touchpads
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: peter.hutterer at who-t.net
            Blocks: 94236, 94911, 96409, 99306

$subject says it all, this is mostly just a tracker bug so that we can have
dependent bugs.

For comparison: 
synaptics behaviour is to use a Schmitt trigger with a default of 9.8% for
'low' and 11.7% for 'high' (25/256 and 30/256, respectively). There are
model-specific cases, (some) apple touchpads use an absolute value range of
70/75 and all elantech touchpads just use the pressure minimum + 1.
The elantech value is questionable though and should be reviewed.


libinput likely needs some extra bits to be able to assign per-device values
from the udev hwdb or similar.


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=94236
[Bug 94236] Palm detection: ignore moves over a pressure threshold
https://bugs.freedesktop.org/show_bug.cgi?id=94911
[Bug 94911] MacBook Air Mid 2011 too eager to detect thumbs
https://bugs.freedesktop.org/show_bug.cgi?id=96409
[Bug 96409] MacBook Air clickpad is too sensitive
https://bugs.freedesktop.org/show_bug.cgi?id=99306
[Bug 99306] Extremely jittery touchpad
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