Created attachment 129625 [details]
both states side by side
Plasmashell occasionally forgets to load widgets (folderview and application launchers) and displays the default desktop wallpaper. opposed to what can be found in the configuration file "plasma-org.kde.plasma.desktop-appletsrc"
this should be reproducable with the following image (basically kubuntu 20.04 with extra applications)
no need to copy this on a flashdrive - it's also reproducable in virtualbox
STEPS TO REPRODUCE
1. new virtual machine (ubuntu 64, no disk) - add iso as live cd (i made 3 vms in order to test faster)
2. start virtual machine
PARTS of the "plasma-org.kde.plasma.desktop-appletsrc" are ignored (they stay in the configfile but they are ignored)
desktop starts with default desktop wallpaper - without widgets in the containment
plasma panel has the correct configuration as defined in the config and widgets in the plasma panel also work as expected
load configured desktop with all widgets and launchers
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
it is absolutely not reproducable.. first it happend when booting macs with the live usb flashdrive without acpi
it made no sense
then i tried in virtualbox and played with the settings.. nothing came up.. it happens absolutely RANDOM
i have 3 identical virtual machines.. if i start them one after the other.. at least one of them will display only half of the configuration correctly
i already deleted the configuration files und started from scratch with a fresh config.. same thing happend so it shouldn't be a bug in the config
Created attachment 129626 [details]
3 identical virtual machines boot the same iso
i have to add information about the configuration:
[Containments] stays exactly the same.. (the panel)
[Containments] stays exactly the same.. (systemtray)
(which holds all of the widgets and the desktop wallpaper)
is replaced by
The activityId also stays the same..
so the question is.. what in the world makes plasma think it can switch from desktop containment to folderview RANDOMLY ???
it is also resultion independend.. it happens on vga, svga, hd, fullhd
Created attachment 132120 [details]
xsession-errors from a failed plasma start
org.kde.plasma: requesting config for "Arbeitsfläche" without a containment!
this is one thing that seems to be related :-)
this bug seems to be related
this bug is related to
thx to the live image i created you can replay this as often as you want (just reset the virtualbox vm as long as neccesary to reproduce the behaviour - then analyze ;-)
Created attachment 132552 [details]
on the left side there is no activity visible even if the "default" activity is still there in the activity settings dialog
so i tried to clean up everything kscreen related.. it didn't help.
i just figured out that the problem is most likely related to "ACTIVITIES"
when i hit "meta+tab" in a working VM the "activity bar" shows up on the left side of the screen.
in the faulty VW nothing happens.
the "activity bar" shows up when i use the desktop context menu and for some reason it is empty
the "default" activity is still visible in the activity settings but it seems to be unused
*** Bug 428463 has been marked as a duplicate of this bug. ***
Same thing happens to me on current KDE Neon with Plasma 5.20.1 (and a few versions before).
Things that might be useful to know:
it's a 3 display setup and when it happens, it's per screen - meaning it usually affects one or two of them.
activity switcher shows only "New Activity" on all screens - "Desktop" (the other configured one) is not shown.
I'll attach my xsession-errors, too.
Created attachment 132905 [details]
xsession-errors for 3 display setup
I have the same issue on KDE Neon 5.20
I have a dual monitor setup and it is always the right one (the secondary monitor) that looses its wallpaper that looses it every so often after booting up my computer.
I don't have anything else on the Desktop of the 2nd screen so I can't tell whether it would mess with that as well.
Note also that I have the same wallpaper on my left screen as I have on the right one, so it can't be related to Plasma not finding the image (yet).
*** This bug has been marked as a duplicate of bug 427861 ***