Bug 486983

Summary:	Switching to another layout (while pressed) does not work correctly
Product:	[Applications] systemsettings	Reporter:	H. Peter Anvin <hpa>
Component:	kcm_keyboard	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	normal	CC:	butirsky, duha.bugs, kdedev, matthias, natalie_clarius
Priority:	NOR
Version First Reported In:	6.1.5
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description H. Peter Anvin 2024-05-13 20:04:33 UTC

SUMMARY

When using one of the Keyboard > Advanced > Switching to another layout > ... (while pressed) options, KDE will *permanently* switch to the second layout; after that, either pressing or releasing the key has no effect.

STEPS TO REPRODUCE
1. Define more than one keyboard layout
2. Set the option Advanced > Switching to another layout > Right Ctrl (while pressed)
3. Type some using the first layout
4. Press Right Ctrl + some key to type using the second layout
5. Release Right Ctrl. Try to type again using the first layout

OBSERVED RESULT
At point 5, the second keyboard layout will be used.

EXPECTED RESULT
The first keyboard layout should be used.


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Fedora 40, plasma-systemsettings-6.0.4-1.fc40.x86_64, kwin-wayland-6.0.4.1-2.fc40.x86_64
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: qt6-qtbase-6.7.0-5.fc40.x86_64

ADDITIONAL INFORMATION

Comment 1 Matthias Blaicher 2024-10-01 07:06:31 UTC

I also encounter this bug on wayland (not X11), running Plasma 6.1.5.

Linux: Nixos master
KDE Plasma Version: 6.15
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.0
Graphics Platform: Wayland

Comment 2 Matthias Blaicher 2024-10-01 07:29:51 UTC

Alright, so this is even more complicated:

* The floating layout indicator only shows the "second" layout being activated. So does the indicator in the taskbar.
* However, the KWin debug console window _does_ show the correct "Current Layout" in the Keyboard tab actively switching while the "while pressed" button is pressed. It is, in fact, extremely responsive.
* The switching _does_ work for _wayland_ applications - but not for X11 windows as verified with `xev`. 
* X11 keyboard switching _does_ work when manually toggling a "permanent" switch using the taskbar layout indicator.

Comment 3 Matthias Blaicher 2024-10-28 04:40:19 UTC

Still happening on

Operating System: NixOS nightly
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.5 (64-bit)
Graphics Platform: Wayland

Comment 4 Matthias Blaicher 2025-02-14 15:15:48 UTC

Still happening on 

Operating System: NixOS 25.05 (master as of 25/02/14)
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.2 (64-bit)
Graphics Platform: Wayland

Comment 5 Matthias Blaicher 2025-03-16 09:32:52 UTC

Still happening on 

KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.7 (64-bit)
Graphics Platform: Wayland

Comment 6 Matthias Blaicher 2025-06-19 15:18:53 UTC

Still happening on

KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.0

Comment 7 Matthias Blaicher 2025-10-12 08:09:30 UTC

Still happening on 

Operating System: NixOS 25.11 (master, 749cabed2cc265f629c6c83322de345d6f37f7cd)
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.17.1 (64-bit)
Graphics Platform: Wayland

Comment 8 TraceyC 2025-12-31 17:52:45 UTC

I'm not able to reproduce this in Plasma built from git-master.

Note: The GUI has been redesigned. "Advanced" has been renamed to "Configure Key Bindings"
I have 3 keyboard layouts

With "Left Alt (while pressed)" or "Right Alt (while pressed)" or "Right Ctrl (while pressed) - Can *not* reproduce the bug - releasing the key returns the system to the default keyboard layout. I tested with KWrite

Hopefully this means it's fixed in Plasma 6.6. I'll set this to NEEDSINFO to remind folks to check
Also, please let us know if this happens with all applications or specific ones, there have been problems specific to xwayland apps