Bug 97425 - First scroll event after enabling edge-scrolling is ignored
Summary: First scroll event after enabling edge-scrolling is ignored
Status: RESOLVED FIXED
Alias: None
Product: Wayland
Classification: Unclassified
Component: libinput (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Wayland bug list
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Reported: 2016-08-21 07:22 UTC by Sebastian Keller
Modified: 2016-08-22 21:23 UTC (History)
1 user (show)

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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 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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