[Wayland-bugs] [Bug 106141] Thinkpad X240 touchpad movement is jumpy and extremely imprecise

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106141

--- Comment #16 from Peter Hutterer <peter.hutterer at who-t.net> ---
ok, I just replayed this here to check a patch that I thought would fix this -
this data is complete garbage. It has a distinct saw tooth behaviour that
causes the jumpy behaviour, e.g.:

19.038526: ↙↓   -1/   1 |  *********** | 
19.047722: ↙←   -2/   1 |  *********** | 
19.057847: ↙←   -2/   1 |  *********** | 
19.068035: ↙←   -4/   1 |  *********** | 
19.078270: ↙←  -22/   1 |  *********** | 
19.088396: ↙←  -22/  21 |  *********** | 
19.097523: ↙↓   -1/  21 |  *********** | 
19.107754: ↙↓   -2/  21 |  *********** | 
19.117948: ↙↓   -1/  21 |  *********** | 
19.128083: ↙↓   -2/  21 |  *********** | 

or:

17.026707: →↘   22/   1 |  *********** | 
17.036102: →↘   22/   1 |  *********** | 
17.046134: →↘   22/   1 |  *********** | 
17.056361: →↘   22/   1 |  *********** | 
17.066739: →↘    1/   1 |  *********** | 
17.096367: →↘    1/   1 |  *********** | 
17.106718: ↓↘    1/  19 |  *********** | 
17.116698: ↓↘    1/  19 |  *********** | 
17.127087: ↓↘    1/  19 |  *********** | 
17.137231: ↓↘    1/  19 |  *********** |

The questions in comment #15 are still valid but I suspect the only way to get
rid of those jumps is by turning the pointer acceleration down by quite a bit.

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