[Wayland-bugs] [Bug 99139] Delay after resting thumb

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99139

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|NEEDINFO                    |RESOLVED

--- Comment #10 from Peter Hutterer <peter.hutterer at who-t.net> ---
ok, reconstructed the file here and the basic problem is: our thumb detection
currently only works on the very bottom of the touchpad, see
https://wayland.freedesktop.org/libinput/doc/latest/palm_detection.html

>From what I can tell, your thumb rests in the center of the touchpad, about 1/3
up from the bottom. So it's detected as normal finger and thus the motion
becomes a two-finger scroll motion. Indeed, that's what I see in
libinput-debug-events (run with --verbose for more info).

I'm assuming the delay is thus caused by these scroll events, unless you have
something scrollable under the cursor it will appear as a motion delay. In this
recording, the pointer movement doesn't start until you lift one finger at the
0.541628 event. 

Also note that your touchpad support pressure so we really can't tell whether a
finger is a thumb or a normal finger. All I can recommend here is that you
either only place the thumb in the software button area at the bottom of the
touchpad or not rest your thumb on the touchpad, sorry.

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