Thanks for your advices.
Testing with only one device connected does not resolve the issue.
The discord link to root is unclear. I haven't looked into this solution further.
The screen saver is only set up with certain films launched via Kodi... weird
Hello,
I'm "digging up" this post because I also have issue with this problem of a fireworks screen saver which is activated while watching a film via a media application (Kodi).
Zipperhead: have you found a solution since your last message?