Bug 504669

Summary: If kwin_x11 is not installed there is still an entry in login manager (i.e. sddm) that allow to log in a broken session
Product: [Plasma] kwin Reporter: dmatteo002
Component: platform-x11-standaloneAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED INTENTIONAL    
Severity: major CC: dmatteo002, fernandommuniz, nate, vlad.zahorodnii, xaver.hugl
Priority: VHI    
Version First Reported In: 6.3.90   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description dmatteo002 2025-05-22 14:07:51 UTC 
SUMMARY
Because plasma-workspace is the one that generate .desktop file for both plasmaX11 and plasmaWayland, that cause to have a possibly broken session in sddm.

If that session is open the only way to exit it is either run a command in a terminal or forcefully shutdown the pc.

STEPS TO REPRODUCE
1. Uninstall kwin_x11
2. logout/reboot
3. in sddm select plasma X11

OBSERVED RESULT
A session is open that is broken. It is only possible to open app, but decoration, moving/resizing window, and all effects (virtual desktop,...) don't work.

EXPECTED RESULT
The session should not be present if kwin_x11 is not installed (and i image the same if kwin is not installed but kwin_x11 is)

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.3.90
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.7-5-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7735HS with Radeon Graphics
Memory: 16 GiB of RAM (14.9 GiB usable)
Graphics Processor: AMD Radeon 680M

ADDITIONAL INFORMATION
This is not specific to any distro (tested on neon) and as the separation of packages between kwin_x11 and kwin implies, it should be able to only have one of them.
Comment 1 Vlad Zahorodnii 2025-05-22 16:18:12 UTC 
It's okay to have both kwin and kwin-x11 installed at the same time.

The final decision is left to distros. They can install both kwin and kwin-x11, or they can install only kwin but provide X11 session files in a separate package that user should install together with kwin-x11.
Comment 2 Vlad Zahorodnii 2025-05-22 16:18:34 UTC 
Arch Linux developers are already aware of this issue.
Comment 3 Vlad Zahorodnii 2025-05-22 16:29:12 UTC 
It will not hurt to send an email list to the distributions mailing list to talk about this issue though.
Comment 4 Vlad Zahorodnii 2025-05-22 16:29:29 UTC 
send an email to*
Comment 6 Antonio Rojas 2025-05-30 09:28:09 UTC 
*** Bug 505002 has been marked as a duplicate of this bug. ***