Bug 97425

Summary:	First scroll event after enabling edge-scrolling is ignored
Product:	Wayland	Reporter:	Sebastian Keller <sebastian-keller>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	peter.hutterer
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Sebastian Keller 2016-08-21 07:22:11 UTC

So far I've only been able to reproduce this under X + gnome-shell as I couldn't get edge-scrolling to work under wayland + gnome-shell.

To reproduce the bug first make sure 2-finger-scrolling is enabled and edge-scrolling disabled. Then switch to edge-scrolling (using xinput or the native gnome settings in >= 3.21.90) and try to scroll. This results in the following error message and the scroll event being ignored:

(EE) libinput bug: unexpected scroll event 0 in area state

Only the first scroll event after switching is affected. This can be repeated by switching to 2-finger-scrolling and back again.

Comment 1 Peter Hutterer 2016-08-22 08:31:13 UTC

https://lists.freedesktop.org/archives/wayland-devel/2016-August/030790.html

Comment 2 Peter Hutterer 2016-08-22 21:23:07 UTC

commit b1a811ee521dc56ed5d1c789251fad245b758a80
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Mon Aug 22 16:06:59 2016 +1000

    touchpad: reset the edge scroll state on touch up if edge scroll is disabled

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