[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #7 from Peter Hutterer <peter.hutterer at who-t.net> ---
Did you notice any changes in the behaviour with the patch applied? Looking at
this latest recording, there are two categories of jumps:

 6.735493:              |  *********** |  *********** |  *********** | 
*********** | 
 6.745580:              |  *********** |  *********** |  *********** | 
*********** | 
 6.796415:              |  *********** |  *********** |  *********** | 
*********** | 
 6.826930:              |  *********** |  *********** |  *********** | 
*********** | 
 6.897885:              |  *********** |  *********** |  *********** | 
*********** | 
 6.907994:              |  *********** |  *********** |  *********** | 
*********** | 
 6.928296: →↘   20/   3 |  *********** |  *********** |  *********** | 
*********** | 
 6.938448: ↙↓   -1/   3 |  *********** |  *********** |  *********** | 
*********** | 
 6.948594: ↓↘    1/   3 |  *********** |  *********** |  *********** | 
*********** | 

i.e. lots of nothings, then a jump, then normal motion. This type of jump
should be fixed with the bug.

 5.101908:              |  *********** |  *********** |  *********** | 
*********** | 
 5.152933:              |  *********** |  *********** |  *********** | 
*********** | 
 5.162819:              |  *********** |  *********** |  *********** | 
*********** | 
 5.213504: →↘   20/   3 |  *********** |  *********** |  *********** | 
*********** | 
 5.233803: →↗   20/  -1 |  *********** |  *********** |  *********** | 
*********** | 
 5.243927: →↘   20/   1 |  *********** |  *********** |  *********** | 
*********** | 
 5.264403: →↘    1/   1 |  *********** |  *********** |  *********** | 
*********** | 

i.e. lots of nothings, then *multiple* jumps, in this case three. There's
another one with three jumps of 17 as well but the recording in the other bug
had 2 and 4 events as well. Problem is: these don't look anything special, we
cannot easily detect those because they're indistinguishable from a real move.

So yeah, I don't really know what to do here.

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