[Wayland-bugs] [Bug 98839] Somehow conditionalize hysteresis (hardware black/whitelist, device property introspection, user-exposed setting, etc)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98839

--- Comment #57 from Peter Hutterer <peter.hutterer at who-t.net> ---
doh, I thought I had pushed the !enabled fixed, done now and force-pushed so
the branch is up-to-date and ready for testing. Thanks for spotting that.
Commit is currently 1b251c2676130 but I may need to push more later.

The current event count of 5 means holding the finger stationary for ~60ms on
most touchpads. That's short enough that I can trigger it here even when trying
not to, usually it triggers before I even start moving the fingers, right after
I place it on the touchpad for the first time. That's on a T440 which is
equivalent to the X1 3rd iirc, so an older touchpad.

I recommend testing with sudo ./build/libinput-debug-events --verbose, that
prints a message when the hysteresis is disabled. If the message appears, then
hysteresis is ignored.

Nate: attachment 135028 has several non-moving event streams that last a second
or even longer. So it should definitely activate on your touchpad. I tested all
the attachments above (still and moving) and they all disable the hysteresis
within the first fraction of a second, before the first events come out of the
device.

The only case where the period may be significantly longer than 60ms would be
if the touchpad firmware filters pressure and you don't get *any* events before
the next motion event some time later. That can happen, see E 1.557756 in
Nate's attachment 135029 which is 119ms after the previous one. But that is the
exception. Needs fixing, sure, but a very niche issue.

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