[systemsettings] [Bug 398713] [X11, Libinput] Selecting flat mouse acceleration profile doesn't turn off acceleration

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=398713

--- Comment #24 from warloxxjay at gmail.com ---
> flat acceleration just isn't the same as no acceleration.
Actually it is exactly that. The name "acceleration factor" might just be a bit
of a confusing name. Its just a factor that results from some acceleration
calculation, and when not used gets set to 1 as to not have any effect
(multiplicative identity element). 

A constant acceleration factor of 1 (Flat profile) will cause no acceleration.
Since the factor really is just a proportional gain of mouse movement to
pointer movement. If the term where 0 the pointer would not move at all
anymore. This is basically a setting of how fast you want you pointer in
relation to the movement of your mouse.

The acceleration only happens when this term is not constant but depending on
the current speed of you mouse movements. This happens in the adaptive profile.
On higher mouse speeds the proportional term gets increased. This causes a fast
movement of distance X resulting in a bigger pointer movement in the adaptive
profile than in the flat profile.

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