[Wayland-bugs] [Bug 101139] Acceleration still too slow with medium finger movements

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https://bugs.freedesktop.org/show_bug.cgi?id=101139

--- Comment #19 from Peter Hutterer <peter.hutterer at who-t.net> ---
(In reply to Greg Reichow from comment #16)
> On your question on the circle, at a speed setting of 0, a 1cm circle on my
> touchpad = about 3.5cm circle on screen.  (My best attempt to measure, don't
> read too much into the accuracy of this.)

close enough, thanks. This indicates at least that we're not talking about two
completely reactions but rather preferences. fwiw, at the -0.8 setting with
current master, 1cm on the touchpad maps to ~1cm on the screen and the screen
cursor feels like it's just a tad slower than the finger, a movement not
triggering any acceleration eventually has the finger overtake the cursor.

While that's acceptable for something that close to the lower range limit of
-1, it would be way too slow for anything above.

At a speed setting of 0.9 the cursor is effectively uncontrollable. Any faster
movement hits the edge, a fast ~2cm movement crosses the whole screen. Again,
for 0.9 that's acceptable because it's the upper range. But I'm really curious
that you want such a slow default speed and such a fast acceleration. I tried
your curve and the pointer is almost uncontrollable for me. When acceleration
kicks in it shoots to an edge way too quickly, I end up overshooting by 5-10cm
on anything but fast movements. So what's going on here?

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