Comment by mappu
17 hours ago
What modern display manager doesn't let you? In KDE the screensaver is merged into the screen locker settings, you can pick any "wallpaper plugin" which includes slideshows, video, or animation if you plug in e.g. https://store.kde.org/p/2143912 or https://store.kde.org/p/2194089
Wayland doesn't support screen savers: https://www.jwz.org/blog/2023/09/wayland-and-screen-savers/