As indicated in https://github.com/linuxmint/Cinnamon/issues/4060#issuecomment-93941975, Cinnamon tests for systemd-logind or old upower:
https://github.com/linuxmint/cinnamon-session/blob/master/cinnamon-session/csm-logout-dialog.c#L190
Apparently, the new systemd-login is still not supported.
As indicated in https:/ /github. com/linuxmint/ Cinnamon/ issues/ 4060#issuecomme nt-93941975, Cinnamon tests for systemd-logind or old upower:
https:/ /github. com/linuxmint/ cinnamon- session/ blob/master/ cinnamon- session/ csm-logout- dialog. c#L190
Apparently, the new systemd-login is still not supported.