https://bugs.freedesktop.org/show_bug.cgi?id=103086
--- Comment #5 from Jason Gerecke <[email protected]> ---
(In reply to Peter Hutterer from comment #3)
> It happens most frequently with worn-out tools but that doesn't rule out
> that it can happen with new pens. The pressure offset in your pen is really
> small and the pressure drops 837, 714, 352, and then hovers below 10.
>
> This is in the kernel data though, I'm suprised X behaves differently -
> unless you're using the wacom driver. CC-ing Jason - do we have something
> there that takes this offset into account?
I ran into an issue like this with one of our new "Pro Pen 3D" pens: I'd
occasionally get non-zero pressure values out of the tablet when hovering. This
caused some confusion when looking through the evemu-record logs, but didn't
seem to impact X.
The xf86-input-wacom driver has a click pressure threshold that defaults to
1.32%* of full-scale pressure. The values in the attached log fall under this
threshold, which is likely why there's no observed issue in X.
* 27/2047 for the pedantic
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