The Manjaro Plasma unstable upgrade for today caused a non recoverable session locking problem. Switching to the testing branch and executing pacman -Syyuu by way of ssh fixed the issue. I did not allow the replacement of Kwayland-server for the testing update.
A repeated execution of systemctl suspend now fixes the playback speed issue. But a suspension by timeout can repeat the problem.This also holds for Mobian.
If I were sufficiently frustrated, then I would disengage by switching to the stable branch of Manjaro Plasma and testing the upgrades of Manjaro and Mobian once per week, or even less often.
A repeated execution of systemctl suspend now fixes the playback speed issue. But a suspension by timeout can repeat the problem.This also holds for Mobian.
If I were sufficiently frustrated, then I would disengage by switching to the stable branch of Manjaro Plasma and testing the upgrades of Manjaro and Mobian once per week, or even less often.