[Wayland-bugs] [Bug 91369] Libinput 0.19 and 0.20 ignore POINTINGSTICK_CONST_ACCEL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91369

--- Comment #33 from Justin Wong <justin.w.xd at gmail.com> ---
> by feel mostly. and the fact that this accel method was largely aimed at
> mice and the number of 200dpi mice is so low we don't really need to care
> about them. and of course the obvious reason: it was relatively easy to
> implement and gave us some solution that was 80% of the way there, which is
> better than 0% :)

I agree with you to make it 80% functional first.

According to my test using mouse-dpi-tool, my trackpoint seems to be even
slower than 200DPI. Maybe we should collect more feedbacks. Currently 200DPI
trackpoint has almost the same accel with 400DPI device, that's apparently
inappropriate.

I still think we should modify incline with `dpi_factor`, no need to 
use `incline * v_us2ms(speed_in - threshold)/dpi_factor + 1`, maybe
`incline * v_us2ms(speed_in - threshold)/(dpi_factor+0.5) + 1` or something,
we can try to find a good value.

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