Description:
After a fresh install of Arch the Power Managment in Cinnamon does not work correctly...
When playing audio (radio stations) in any browser other than Firefox (or browsers based on firefox) neither the screensaver is activated nor the monitor is going to sleep...(But the system is not going to sleep which is fine)
After installing the - libgoa-1.0.so.0 - shared library (included in the package [gnome-online-accounts]) everything works fine

However the system is not going to sleep (while playing audio) which is the expected result

P.S. In Firefox the screensaver is activated, the monitor and the system is going TO SLEEP while playing audio
That's a Firefox (on linux) related problem and has nothing to do with this;

Additional info:
* package version(s)

[Paris@France-U-S-A ~]$ pacman -Q cinnamon
cinnamon 5.2.7-2

* config and/or log files etc.

Nothing of the config files was touched; except the /etc/default/grub

* link to upstream bug report, if any

Steps to reproduce:

[Paris@France-U-S-A ~]$ cinnamon-settings power
libgoa-1.0.so.0: Kann die Shared-Object-Datei nicht öffnen: Datei oder Verzeichnis nicht gefunden
Failed to load module: /usr/lib/cinnamon-control-center-1/panels/libonline-accounts.so
Using pam module (python3-pampy)
/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py:433: DeprecationWarning: Gtk.Window.set_wmclass is deprecated
self.window.set_wmclass(wm_class, wm_class)
Loading Power module
Power module brightness page not available: GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._csd_5fpower_5fmanager_5ferror.Code0: csd-backlight-helper failed: Could not get or set the value of the backlight: No backlight devices present