https://bugs.freedesktop.org/show_bug.cgi?id=105727
Bug ID: 105727
Summary: libinput-1.10.3: two-finger-scrolling snaps back when
lifting fingers
Product: Wayland
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: libinput
Assignee: [email protected]
Reporter: [email protected]
Created attachment 138333
--> https://bugs.freedesktop.org/attachment.cgi?id=138333&action=edit
evemu log showing behavior
Hello.
I'm currently using libinput 1.10.3 with a SynPS/2 Synaptics TouchPad on a
Thinkpad W530. A recent update of libinput, I think either 1.10.2 or 1.10.3
introduced uncomfortable scrolling behavior.
When two-finger-scrolling, very often the scroll operation "snaps back" when I
lift my fingers. By that I mean a scroll event in the opposite direction is
generated.
Here's a debug-events example:
event12 POINTER_AXIS +4.64s vert 2.52* horiz 0.25* (finger)
event12 POINTER_AXIS +4.67s vert 6.83* horiz 0.25* (finger)
....
event12 POINTER_AXIS +5.16s vert 0.36* horiz 0.00 (finger)
event12 POINTER_AXIS +5.24s vert 0.18* horiz -0.25* (finger)
** lifting fingers around now **
event12 POINTER_AXIS +5.36s vert 0.18* horiz -0.25* (finger)
event12 POINTER_AXIS +5.41s vert -13.31* horiz -20.35* (finger)
event12 POINTER_AXIS +5.42s vert 0.00* horiz 0.00* (finger)
The negative vert and horiz event is obvious.
I am also attaching an evemu log that shows how I scroll. It contains three
attempts, the first and third exhibited a snap-back, the second one did not.
It seems I can avoid snap-back by first lifting one finger and then the other.
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