[Wayland-bugs] [Bug 106323] ALPS SS5 (SS4 v2) trackpoint too fast / jumpy because of readout "hole" in the center

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106323

--- Comment #3 from Martin Wilck <mwilck at suse.de> ---
(In reply to Peter Hutterer from comment #2)

> The trackpoint curve is in src/filter-trackpoint.c:trackpoint_accel_profile,
> you can try to put a /8.0 there before returning the factor. Does that
> work/help?

I don't think that'll work well. Unless I'm mistaken, it's pretty much the same
thing as setting the accel factor to -1 or -0.9. It has the effect to make the
pointer REALLY slow.

IMO, to get the best of both worlds for small and large movements with this
stick type, we need to scale down *before* applying the acceleration profile.
That would be the same thing as dividing the filter's "scale_factor" by 8, if I
read the code correctly.

Quoting Masaki Ota from the mail thread:

"If we use Touchpad as Absolute mode, Track stick mode is changed to Raw mode
from Mouse mode.... But TrackStick Raw mode data is much larger than Mouse mode
data. (This is the cause of high speed.)"

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