[Wayland-bugs] [Bug 98835] Touchpad very sensitive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98835

--- Comment #11 from Peter Hutterer <peter.hutterer at who-t.net> ---
Note that the below is half archiving of my thoughts as well as a real comment
:)

(In reply to arjon.bujupi from comment #8)
> Created attachment 128359 [details]
> second.evemu

reminder: this was the fast left-right motion

slight no-motion at the beginning but then a curving motion to the right, so
the finger movement is nicely visible. Almost all of that motion falls into the
maximum acceleration, i.e. the area where we don't scale further but merely
apply the maximum acceleration factor - that's true almost from the beginning
of the motion onwards.

I guess if it goes that easily to the right edge of the screen, we need to
adjust motion speed that the current max acceleration is triggered much later.
In this recording you're reaching the max acceleration factor early despite
going 4 times as fast later.


(In reply to arjon.bujupi from comment #9)
> Created attachment 128360 [details]
> third.evemu

reminder: this was the 2cm click motion. 

I can see by the motion vectors that you overshot a little. most of your
movement falls into the 'acceleration' range, i.e. before we cap the maximum
factor. The immediate first and last movements (i.e. the ones after the
overshoot) were decelerated. Would you say that that cursor movement was still
too fast when correcting for the overshoot (and moving slower)?

Is there a speed setting that makes your touchpad usable for this action? Most
recent suggestion was -0.55 which apparently makes it like macos' touchpad
movement. try with xinput "ETPS/2 Elantech Touchpad" "libinput Accel Speed"
-0.55, and try some other values too please (anything between -1.0 and 0.0
slows down)

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