buffy

Indeed it looks like a bug. I finally found a solution, though. Check the main post edit for details.

Thanks for the reference! Just to be clear, I am no longer interested in live streaming/DSLR as webcam. Nowadays I want to use my computer or a field monitor for tricky focusing situations (macro/astro). Would you know whether a field monitor connected to the camera would output something similar to the USB capture card/computer setup or the TV?

I will very likely migrate to BTRFS on my next install. I'm reading Snapora's repo now, looks like an awesome tool. Thanks for the tip!

I did check it, yes, but the page doesn't appear to be relevant or contain much information. Another comment above (or below) mentioned that KDE Plasma can't run without a compositor.

You are right, I should have made this clear. I am not on Nvidia, I am using an old Thinkpad on Intel Haswell.

I'm glad to know my problem isn't completely new. I'll look into it further online. If you ever find a link to a report of a similar issue, I would be happy to see!

Edit: I found this link, the issue reported appears to be very similar to what I'm seeing here https://libreddit.tux.pizza/r/kde/comments/jhqbnz/kde_plasma_rendering_problem_black_squares/

Edit 2: I finally solved my problem! It was indeed an old problem already reported somewhere.

You are right. Breaking it down in steps of 10 followed by a reboot is actually great advice. I will get to it soon to see if I can find out what is wrong with the system (I am indeed curious).

You are absolutely right. I just tried apt purge kde* plasma* libkf* and apt install kde-full followed by a reboot. But sadly, the problem persists.

I agree with that. I suspect you might be right. SDDM (Breeze) is also weird with transparency. However, I just installed materia-kde but unfortunately the problem persisted (screenshot attached). Before that, I ran apt purge kde* plasma* libkf* and apt install kde-full. That too didn't solve my problem.

Tasksel seems to be correctly set,

~$ tasksel --list-tasks
i desktop       Debian desktop environment
u gnome-desktop GNOME
u xfce-desktop  Xfce
u gnome-flashback-desktop       GNOME Flashback
i kde-desktop   KDE Plasma
u cinnamon-desktop      Cinnamon
u mate-desktop  MATE
u lxde-desktop  LXDE
u lxqt-desktop  LXQt
u web-server    web server
u ssh-server    SSH server
i laptop        laptop

I tried apt reinstall kde-full, but unfortunately nothing changed.

I tried reinstalling kde-full, but sadly nothing happened (all packages were already marked as installed).

I audibly laughed at this. I actually knew I was entering treacherous waters by running apt full-upgrade in Sid, but still thought "well, we'll see..."

Thanks! Some packages were installed, but it didn't solve it yet (even after a reboot).

...
Install: orca:amd64 (46.0-1, automatic), libpcaudio0:amd64 (1.2-2+b2, automatic), speech-dispatcher-audio-plugins:amd64 (0.11.5-4, automatic), python3-brlapi:amd64 (6.6-5, automatic), xbrlapi:amd64 (6.6-5, automatic), speech-dispatcher-espeak-ng:amd64 (0.11.5-4, automatic), libsonic0:amd64 (0.2.0-13, automatic), sound-icons:amd64 (0.1-8, automatic), python3-speechd:amd64 (0.11.5-4, automatic), libespeak-ng1:amd64 (1.51+dfsg-12, automatic), python3-louis:amd64 (3.29.0-1, automatic), x11-session-utils:amd64 (7.7+6+b1, automatic), xkbset:amd64 (0.8-1, automatic), task-desktop:amd64 (3.75, automatic), libdotconf0:amd64 (1.3-0.3+b1, automatic), xorg:amd64 (1:7.7+23, automatic), perl-tk:amd64 (1:804.036+dfsg1-2+b1, automatic), x11-apps:amd64 (7.7+11+b1, automatic), speech-dispatcher:amd64 (0.11.5-4, automatic), espeak-ng-data:amd64 (1.51+dfsg-12, automatic), task-kde-desktop:amd64 (3.75), xinit:amd64 (1.4.2-1, automatic)
End-Date: 2024-03-26  17:42:41