I have noticed of late that my system refuses to go to sleep when I close the lid of the laptop (Asus Rog Strix G531GT).
Sure enough, the setting has disappeared in the Plasma settings:
I am on KDE-Unstable repo.
Has anyone else seen this issue?
Could be that KDE was detecting the available functionality exposed by upower, and the upower update reinstated the “lid close” function so it was detected on a reboot.