--- Comment #17 from Tim Richardson <> ---
in touchpad_accel_profile_linear the value of
const double threshold = accel_filter->threshold
is crucial.

For me, it is defaulting to 254
This speed is hardly reached; it represents very rapid motion on the P50. 

the threshold code is basically not of any practical use because the condition 

 if (speed_in < threshold) {
                factor = 1;

rarely happens. 

I've attached an experimental idea which is working quite well on my P50.
the threshold now depends on filter->speed_adjustment

and the accel function is simplified

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