maintainer-feedback requested: [Bug 272637] x11/sddm: With sddm-0.20.0 plasma shows no power buttons

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-kde (Team)
<kde at FreeBSD.org> for maintainer-feedback:
Bug 272637: x11/sddm: With sddm-0.20.0 plasma shows no power buttons
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272637



--- Description ---
When I update sddm to 0.20.0, the plasma desktop shows no shutdown, reboot or
sleep buttons in the app launcher or elsewhere. If I revert sddm to 0.19.0_8,
the buttons reappear after a reboot cycle.

I didn't investigate yet, DBUS is running and the usual suspects like upower
and ConsoleKit2 are installed. May have to look at the configuration files
changed in the update. The /var/log/sddm.log shows nothing unusual.

Does someone know which power backends are actually used in FreeBSD / X11?