KDE X11 issue after installing and using plasma-wayland-session

I had been curious about how to enable the wayland option for my older KDE Plasma install, thinking I’d like to have the option to try wayland one day. After reading the Did Manjaro KDE switched to Wayland? post I concluded this “new” package was my missing link and proceeded to install plasma-wayland-session, which also prompted to install xorg-wayland as well, and afterwards was prompted to reboot.

Post reboot, I saw the bottom/left selector and confirmed I could see both options (X11 and wayland), and so I thought I’d give the wayland option a go; curiosity killed the cat. After clicking around a bit, I decided to log out and switch back to X11.

After logging back in I noticed my wallpaper was wrong… defaulting to newer blue/orange image. I thought I’d run journalctl to see if anything was posted there… and found that I have a problem with xdg-desktop-portal-kde:

$ journalctl --priority err --boot 0
Jun 09 01:17:00 AM4-5600X-Linux xdg-desktop-portal-kde[12690]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                                               Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
Jun 09 01:17:00 AM4-5600X-Linux systemd-coredump[12694]: [🡕] Process 12690 (xdg-desktop-por) of user 1000 dumped core.
                                                         Module linux-vdso.so.1 with build-id a6913678db0cce9811d35c782542decae1d16452
                                                         Module libuuid.so.1 with build-id 032a21acd159ee3902605e9911be5f86a7df7df9
                                                         Module libxcb-util.so.1 with build-id 4188ebc629b472b560849c5792a69c1803c3d1a4
                                                         Module libxkbcommon-x11.so.0 with build-id c942fd85702bc7165a42bcb102660f9413376572
                                                         Module libICE.so.6 with build-id af53458a64fe1e62a4d95606f7b03c210b2b098c
                                                         Module libSM.so.6 with build-id ac7b055fd3f16b4f29373285ab04ed52eebb632d
                                                         Module libxcb-xinput.so.0 with build-id 409ee697e2b16243bf1fc6429e672f2359033388
                                                         Module libxcb-xkb.so.1 with build-id bad7e1eb65df04a6b2d676a08f68844856edaace
                                                         Module libxcb-xinerama.so.0 with build-id 5d2ab2683447d9bb7bcc49c058dfa06bcb65560d
                                                         Module libxcb-xfixes.so.0 with build-id e231a68d00ee4cfa12a2c31e755a9e2c1e7be450
                                                         Module libxcb-sync.so.1 with build-id 13025f6de23a271636ad321c77eda98801e62e8e
                                                         Module libxcb-shape.so.0 with build-id f9aab9846b5e3523bd534f8a845f36a37d42b3fa
                                                         Module libxcb-render.so.0 with build-id b1ca498d665807ab0ccdafbe8070853efd058173
                                                         Module libxcb-render-util.so.0 with build-id c64fb28ea20a320a9754273d9ea3af85f6f74b17
                                                         Module libxcb-randr.so.0 with build-id c914473ab7592ed5cf5c191200faaac1089c12ad
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                                                         Module libxcb-image.so.0 with build-id ee7f8577926fe7c1d6972036c2f8e6f727e43b1b
                                                         Module libxcb-icccm.so.4 with build-id 73f1e12d76af383aa969a60279ed5ed922045f47
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                                                         Module libXau.so.6 with build-id 1c67764663e07bec24d8951e5fd93f4d165979ff
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                                                         Module libKF5Archive.so.5 with build-id 7f7d5190814159c6d5b8ebbcce35882228189b09
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                                                         Module libXi.so.6 with build-id 16603be937a02a7e61b0b0395d064be7efd86f49
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                                                         Module libvorbisfile.so.3 with build-id 45d2551167a616d448beb033ba49394831992887
                                                         Module ld-linux-x86-64.so.2 with build-id fc93487393eea02b5bc6e76e48976fc325294c24
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                                                         Module libdouble-conversion.so.3 with build-id d162eb67b00f523a3f146b1077ae00fe04d5fb85
                                                         Module libsystemd.so.0 with build-id cdfc45d8f96e3af51b3d041c32f7899a93b86706
                                                         Module libdbus-1.so.3 with build-id 7f4b16b4b407cbae2d7118d6f99610e29a18a56a
                                                         Module libKF5DBusAddons.so.5 with build-id f67c4bdbe31ff35dd1e346189c811bf229ab4e1a
                                                         Module libmount.so.1 with build-id 4436aeea0cd8c01b5a77969e0531184f8b3513ce
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                                                         Module libKF5Crash.so.5 with build-id 5793e2b3bf81a9142cfb833115d1bbb7ffaf669d
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                                                         Module libz.so.1 with build-id fefe3219a96d682ec98fcfb78866b8594298b5a2
                                                         Module libpng16.so.16 with build-id 2dc0bce07f199bf983c07a05fb95a6f4af83a9b3
                                                         Module libGL.so.1 with build-id b915a2e48be6c9fd3cc6f9f4c7aab1f7aeed8a4c
                                                         Module libQt5QmlModels.so.5 with build-id 3aca8e95972fa0b56402ca9d5cf2f101ba4fdd1c
                                                         Module libgcc_s.so.1 with build-id 0e3de903950e35ae59a5de8c00b1817a4a71ca01
                                                         Module libxcb-keysyms.so.1 with build-id 333e5eb4075795f947c924a2085f17e2e2ae7147
                                                         Module libxcb.so.1 with build-id 13d677412a71468381b11092915d231f664d18d3
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                                                         Module libKF5Codecs.so.5 with build-id 49750e18a1134ad0d63d678b6ef4cd486b44f483
                                                         Module libKF5WidgetsAddons.so.5 with build-id 392cedd1407dc850e8676f2315992b4804ccb012
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                                                         Module libKF5JobWidgets.so.5 with build-id 9ce0eb2dd536864ec351c4a6035defeaad134638
                                                         Module libKF5KIOGui.so.5 with build-id c49f2e1aecdea0eb7735bbd3e149bf70adf70f0f
                                                         Module libKF5IconThemes.so.5 with build-id 7086d24255d1a52fbc46005df5152910076ae416
                                                         Module libKF5Solid.so.5 with build-id 145412e41ec1eb1b7fb70653e938232d1216da07
                                                         Module libKF5XmlGui.so.5 with build-id 0a68991da6374820ab277392432312cc733ac977
                                                         Module libKF5Bookmarks.so.5 with build-id 6d2038950221a930285b15a0742f8d4c7a355b4a
                                                         Module libffi.so.8 with build-id f0a9586cf0f42d2b9971bd1065ca3a6b19f4a2c2
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                                                         Module libXtst.so.6 with build-id 96411faea62997274e362f263e65082e601a787b
                                                         Module libQt5X11Extras.so.5 with build-id cc47e381ac9469803fd53bee418d952ad2782202
                                                         Module libX11.so.6 with build-id d8e0be8e0323aa421366f19065ecd1c76405c130
                                                         Module libQt5TextToSpeech.so.5 with build-id e5a59ae504c2f3b55b8c881e148a9f4ee5361273
                                                         Module libcanberra.so.0 with build-id 8ddef69c9b84a86062c88a59510639cd908fc6d3
                                                         Module libc.so.6 with build-id 388993b6ef62f964bc7bf473c069fbfe957b9e44
                                                         Module libstdc++.so.6 with build-id b3eaebcb5369487562e52dd8d016c9cd77f80c54
                                                         Module libQt5Core.so.5 with build-id c38b617c7f758f3327a3cf4d1b4168ec8e4db842
                                                         Module libQt5DBus.so.5 with build-id 9095840053834c1683ba54020b63d7e545cd0f47
                                                         Module libKF5CoreAddons.so.5 with build-id 273e7c5a7cb2fbabf0d895cb82de5e5f191e9f6b
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                                                         Module libKF5ConfigCore.so.5 with build-id 834d1bd13d3bbac5fd141fa08b79d19e7727674d
                                                         Module libKF5Service.so.5 with build-id 12d2ed6e76be6a13381da83759510bf3a6f725ac
                                                         Module libKF5KIOCore.so.5 with build-id 1a92d633d7ee99315c9ee76b901f05341b7e8663
                                                         Module libQt5Qml.so.5 with build-id 3302afd50e5fb5cc942267e9cad5746e4c125ce1
                                                         Module libQt5Gui.so.5 with build-id f2aced11623934e05c00514f8e891a65700fca20
                                                         Module libQt5Quick.so.5 with build-id e64c8602e59b921835da1ffa74aa5a3bfa52a296
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                                                         Module libKF5ConfigGui.so.5 with build-id 1c964c60eba88258e448acd062029a683c48baf1
                                                         Module libKF5ItemViews.so.5 with build-id fab874f5c8eb4f8c4696851adb78f9acf5997886
                                                         Module libQt5PrintSupport.so.5 with build-id f5959ede65b8a22c8802181e3e198fa0749c5114
                                                         Module libKF5WindowSystem.so.5 with build-id b4733339e1c479aa3aeaf0b6a6335509b39f7c61
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                                                         Module libKF5KIOFileWidgets.so.5 with build-id 399b54ad854db4f1bcff07c269987cab2d9ea33e
                                                         Module libwayland-client.so.0 with build-id 95e7368b400dd57e3db2a5c385de71c7dca08879
                                                         Module libKF5WaylandClient.so.5 with build-id 1bd92bc82300211faf1ee4642e2c0ee624cdf0b5
                                                         Module libKF5Notifications.so.5 with build-id 9346ac445cfb2db35e59320ec9478439078dcd3f
                                                         Module xdg-desktop-portal-kde with build-id c8fd597d9a48083ded6bd16ca0eb809770a8e63a
                                                         Stack trace of thread 12690:
                                                         #0  0x00007fcdfb8d636c n/a (libc.so.6 + 0x8e36c)
                                                         #1  0x00007fcdfb886838 raise (libc.so.6 + 0x3e838)
                                                         #2  0x00007fcdfb870535 abort (libc.so.6 + 0x28535)
                                                         #3  0x00007fcdfbd2bedc _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5 + 0x9fedc)
                                                         #4  0x00007fcdfcaaa925 _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5 + 0x13c925)
                                                         #5  0x00007fcdfcaaaf99 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5 + 0x13cf99)
                                                         #6  0x00007fcdfbf1f5eb _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5 + 0x2935eb)
                                                         #7  0x00007fcdfcaab049 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5 + 0x13d049)
                                                         #8  0x00007fcdfd684d6e _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5 + 0x175d6e)
                                                         #9  0x000055c00bafe0d1 n/a (xdg-desktop-portal-kde + 0x1d0d1)
                                                         #10 0x00007fcdfb871290 n/a (libc.so.6 + 0x29290)
                                                         #11 0x00007fcdfb87134a __libc_start_main (libc.so.6 + 0x2934a)
                                                         #12 0x000055c00baff545 n/a (xdg-desktop-portal-kde + 0x1e545)
                                                         ELF object binary architecture: AMD x86-64
Jun 09 01:17:00 AM4-5600X-Linux systemd[1196]: Failed to start Xdg Desktop Portal For KDE.

How do I fix this problem properly? I don’t want to make any more assumptions that might make things worse.

Might I have lost more than just my wallpaper settings? If so, might my daily Back In Time of my home folder come in handy?

EDIT: I figured a reboot wouldn’t make things worse and gave that a go. Post reboot journalctl --priority err --boot 0 is clean, so the errors did not repeat.

I’d still appreciate a hand understanding what happened, how I can avoid this issue going forward, how/what I may need to recovery beyond my wallpaper, what (if anything) I should uninstall, etc…

EDIT 2: Post reboot, I got curious and thought I’d confirm the logs were clear of anything else prior or leading up to my reboot… and found what I assume to be further errors created during the reboot process:

$ journalctl --priority err --boot -1
Jun 09 01:45:23 AM4-5600X-Linux systemd-logind[863]: Failed to start autovt@tty2.service: Transaction for getty@tty2.service/start is destructive (reboot.target has 'start' job queued, but 'stop' is included in transaction).
Jun 09 01:45:23 AM4-5600X-Linux systemd-coredump[114400]: Failed to connect to coredump service: Connection refused
Jun 09 01:45:23 AM4-5600X-Linux kded5[114399]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                               Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
Jun 09 01:45:23 AM4-5600X-Linux systemd-coredump[114402]: Failed to connect to coredump service: Connection refused

uninstall the wayland session, and reboot and check… if you still got errors, use the backup you mentioned in your post, reboot and check

Thank you for the reply @brahma.

As noted in one of my edits that a reboot did not generate any further errors or coredumps… so that part I hope is good news.

If the post I linked is correct in that plasma-wayland-session is now installed by default in the newer ISO’s… I’m okay leaving it installed and not using it (once bitten twice shy), unless uninstalling fixes something. The logs were clean keeping it installed after another reboot, so I take that as a somewhat positive sign as well.

For the most part I guess I’m concerned that if my wallpaper changed and my desktop icons reorganized themselves… what other settings, data, or files might have been impacted?

Also, assuming it’s not normal that switching between wayland and x11 “mishandles”/loses some settings… what might I have done incorrectly? Was there maybe another package I needed to install, or was there a configuration step I was unaware of?

you did nothing wrong, wayland is not ready for kde … so if you have no errors in logs, you good to go now…

okay, I think I had a fundamental misconception that wayland versus plasma was a different mode or environment when really that’s not the case… the DE is always KDE Plasma and the graphical server/engine being used is where wayland and x11 come into play.

In that misconception, it’s quite possible that the wallpaper change (and even icon shuffle) might have already happened when I logged into wayland. I honestly only clicked around the system tray for 5 seconds before i logged out and was oblivious to the rest of the desktop.

And because I only logged out of wayland to log back to x11, I didn’t pay close enough attention to the time and timestamps to know if the initial “–boot 0” entries happened within wayland or after i logged out and logged back into x11.

yah, lots to learn here… pehaps the most important being to not try new things while beimg tired at 1am.

Solid advice. My personal advice would prepend that advice with: research, research, research first.

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