https://bugs.kde.org/show_bug.cgi?id=468217

--- Comment #1 from Jake <bugs....@ja-ke.tech> ---
With a 125 Hz mouse I also experience the issue, so probably not related to
polling.

It seems to be caused by the recent addition of a custom accel profile and
changed interface, which is now also exposed by xf86-input-libinput. Check on
the slave pointer id, for example:
```
>$ xinput list
>...
>⎜   ↳ Logitech MX Master 3                      id=17   [slave  pointer  (2)]

With 1.2.1 it had only 2 values (adaptive, flat):
>$ xinput list-props 17 | grep 'Accel Profile Enabled'
>        libinput Accel Profile Enabled (295):   0, 1
>        libinput Accel Profile Enabled Default (296):   1, 0

KDE set it correctly the the second/flat.

With 1.3.0 there are 3 values (adaptive, flat, custom):
>$ xinput list-props 17 | grep 'Accel Profile Enabled'
>       libinput Accel Profile Enabled (295):   1, 0, 0
>       libinput Accel Profile Enabled Default (296):   1, 0, 0

No matter what is selected in KDE it always stays on the first/adaptive
profile.
Another workaround is to set it with xinput, then it behaves flat like before:
>$ xinput set-prop 17 'libinput Accel Profile Enabled' 0 1 0

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