[Wayland-bugs] [Bug 90735] Touchpad does not feel "right", acceleration issue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90735

--- Comment #23 from Peter Hutterer <peter.hutterer at who-t.net> ---
Velimir, works for me, feels just fine on my T440 here, fwiw the decel was
something I that would've made a return anyway, it just was missing from the
branch I'm working on here.
Not sure you're aware of this, but this one has a jump at the threshold where
it goes from ~0.28 to 0.3. Other than that it's pretty much a straight line
from (0, 0.2) to (3, 0.4) with no plateaus like the current code.

so this could be simplified with:
  speed = 0.0666 * speed_in + 0.2;
  factor = min(max_accel, speed)



fwiw ./tools/ptraccel-debug --mode=accel produces a graph of the accel
function, though you'll need this diff first:
+++ b/tools/ptraccel-debug.c
@@ -276,7 +276,8 @@ main(int argc, char **argv)
        if (dpi < 1000)
                profile = pointer_accel_profile_linear_low_dpi;
        else
-               profile = pointer_accel_profile_linear;
+               profile = touchpad_accel_profile_linear;
+       //      profile = pointer_accel_profile_linear;

        filter = create_pointer_accelerator_filter(profile, dpi);
           assert(filter != NULL);

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