Bug 455882

Summary: [REGRESSION] $KDEWM is ignored, kwin_x11 starts instead
Product: [Plasma] plasmashell Reporter: Konstantin Kharlamov <Hi-Angel>
Component: Startup processAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: normal CC: kde
Priority: NOR    
Version: 5.25.1   
Target Milestone: 1.0   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Konstantin Kharlamov 2022-06-24 11:29:51 UTC 
SUMMARY

After upgrading `plasma-workspace` from 5.24.5 to 5.25.1 when starting a plasma-i3 session¹, instead of i3 (as defined in KDEWM environment variable) it starts a kwin_x11 window manager.

Downgrading `plasma-workspace` to 5.24.5 and restarting SDDM fixes the problem.

1: Documented here https://userbase.kde.org/Tutorials/Using_Other_Window_Managers_with_Plasma#System_Wide:_Adding_an_XSession

STEPS TO REPRODUCE
1. Make sure you have installed Plasma and i3wm
2. Create `/usr/share/xsessions/plasma-i3.desktop` with the following content:
    [Desktop Entry]
    Type=XSession
    Exec=env KDEWM=/usr/bin/i3 --shmlog-size=26214400 /usr/bin/startplasma-x11
    DesktopNames=KDE
    Name=Plasma with i3
    Comment=Plasma with i3
3. Restart DM and start a graphics session called "Plasma with i3"
4. Once the session loaded, execute `ps aux | grep "[k]win"`

OBSERVED RESULT

Last command has output (the running kwin_x11 process)

EXPECTED RESULT

There's no output

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Archlinux
KDE Plasma Version: 5.25.1
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5
Comment 1 Antonio Rojas 2022-06-24 12:40:23 UTC 

*** This bug has been marked as a duplicate of bug 455452 ***
Comment 2 Antonio Rojas 2022-06-24 12:40:59 UTC 

*** This bug has been marked as a duplicate of bug 439481 ***