Bug 408029

Summary:	Scrolling in evince when window does not have focus does not work (Xinput2-related)
Product:	[Plasma] kwin	Reporter:	Ralf Jung <post>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	asturm, nate
Priority:	NOR
Version First Reported In:	5.14.5
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Ralf Jung 2019-05-28 12:27:47 UTC

SUMMARY
When scrolling in an evince window that does not have focus, nothing happens.

STEPS TO REPRODUCE
1. Open evince, make it cover half the screen.
2. Put some other window on the other half and give it focus.
3. Hover the mouse over the evince window without clicking, and turn the scroll wheel.

OBSERVED RESULT
Nothing happens.


EXPECTED RESULT
It should scroll.

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 10
KDE Plasma Version: 5.14.5
Qt Version: 5.11.3
KDE Frameworks Version: 5.54.0
Kernel Version: 4.19.0-5-amd64
OS Type: 64-bit

ADDITIONAL INFORMATION
First reported against evince/GTK at https://gitlab.gnome.org/GNOME/gtk/issues/949. However, after discovering that setting GDK_CORE_DEVICE_EVENTS=1 in the environment works around the issue, they concluded that this has something to do with KWin not supporting Xinput2 (?).

Curiously, when I use two-finger scrolling on my touchpad to scroll, evince *does* scroll properly. It's only mouse wheel scrolling that gets "lost", and only when the evince window does not have focus.

Comment 1 Nate Graham 2019-05-28 15:05:49 UTC

Are you using Libinput as your input driver?

Comment 2 Ralf Jung 2019-05-28 15:19:06 UTC

How do I figure that out?  I think I left most everything at the default value.

Comment 3 Nate Graham 2019-05-28 15:23:48 UTC

just search for whether or not Libinput is installed. That should be enough.

apt search libinput | grep -i installed

Comment 4 Ralf Jung 2019-05-28 15:31:22 UTC

Looks like it is:

libinput-bin/testing,unstable,now 1.12.6-2 amd64 [installed,automatic]
libinput10/testing,unstable,now 1.12.6-2 amd64 [installed,automatic]
xserver-xorg-input-libinput/testing,unstable,now 0.28.2-2 amd64 [installed,automatic]

Comment 5 Nate Graham 2019-05-28 15:48:12 UTC

Thanks for the info.

Comment 6 Vlad Zahorodnii 2019-06-07 10:58:59 UTC

Perhaps the libinput driver has nothing to do with this.

For some reason, GTK clients do not like replayed events.

Comment 7 Andreas Sturmlechner 2020-04-02 12:21:45 UTC

This is likely a duplicate of bug 394772.

Comment 8 Nate Graham 2020-04-02 14:47:02 UTC

Yep.

*** This bug has been marked as a duplicate of bug 394772 ***