Comment by mappu
2 days 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/
He said (2023) it needs an extension protocol or per-compositor work - so screensaver support is available in KDE using the Screen Locker integration, just no port was done AFAICS.
A general "wayland" protocol for it didn't exist back then, but in this thread we see ext-session-lock exists now, and jwz was recently trying to use it where available: https://www.jwz.org/blog/2025/07/xscreensaver-wayland-and-lo... so you might see an xscreensaver port soon.