Bug 444195

Summary:	Certain UI elements in some applications stop responding to clicks
Product:	[Plasma] kwin	Reporter:	Linus Kardell <linus.kardell>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	nate
Priority:	NOR
Version:	5.22.5
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Linus Kardell 2021-10-21 14:22:40 UTC

SUMMARY
Sometimes some UI elements in various applications stop responding to clicks, and instead trying to click it activates the UI element behind it. Symptoms I've noticed is that you stop being able to click scrollbars and editor pop-ups in VSCode, and merge arrows and crosses in Meld. You also stop being able to drag folders in the bookmarks toolbar in Firefox.

I haven't been able to find any exact steps to reproduce it, but it tends to happen when I've been on a different activity or desktop and then switch back to the activity/desktop with the application on it it. It then starts responding normally again if I click a different window and go back to the affected window. It also tends to happen when I bring up Yakuake. Not sure exactly where the the bug is, whether it's due to kwin, or something in GTK, or in the applications themselves (but that would be unlikely since I see similar issues in multiple unrelated applications).

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20211012
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Kernel Version: 5.14.9-1-default (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor
Memory: 62.7 Gibyte of RAM
Graphics Processor: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2

Comment 1 Nate Graham 2021-10-21 17:35:03 UTC

KWin isn't responsible for input on X11; seems like an X server or input driver problem?

Comment 2 Linus Kardell 2021-11-02 14:04:30 UTC

Perhaps. Don't see how it would be a driver though, the clicks still go to the application, just to the wrong part of it, but I don't know much about that.

Comment 3 Linus Kardell 2021-11-05 14:36:36 UTC

Also reported at https://bugzilla.opensuse.org/show_bug.cgi?id=1192388 and https://github.com/microsoft/vscode/issues/133371.

Guess it's not a KDE issue, because it also happens in IceWM (and way more consistently at that).

Comment 4 Nate Graham 2021-11-05 21:15:06 UTC

OK, thanks!