[Wayland-bugs] [Bug 96409] MacBook Air clickpad is too sensitive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96409

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
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                 CC|                            |peter.hutterer at who-t.net
             Status|NEW                         |ASSIGNED

--- Comment #5 from Peter Hutterer <peter.hutterer at who-t.net> ---
basic problem: BTN_TOUCH is sent by the touchpad regardless of the pressure
(afaict). That causes libinput to assume that there is a finger on the
touchpad.

we change this to support hovering, but that means we need a pressure threshold
and they are notoriously had to get right and we don't have the hooks for this
in libinput just yet.

from what I can tell by looking at your recordings:
no pressure: max 69
low pressure: max 108
normal pressure: max 156
high pressure: max 172

but there's a fair bit of overlap. I suspect the magic point is around the 100
mark. 


The ABS_MT_WIDTH_MAJOR/MINOR is effectively useless, the touches are all in the
20-23mm mark. No pressure has a few in the 18-19 mark but there's at least one
with 24x22mm in there (which is more than any of the high-pressure ones)

ABS_MT_TOUCH_MAJOR/MINOR may be useful, but I have yet to figure out what those
numbers mean, they are always a bit random

so to get anywhere here, we'd need a lower pressure threshold to support
hovering on these devices.

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