Hello @13hannes11, this reads like a restriction in the Flathub-provided Steam packaging, not an issue with the Steam client itself. That is being tracked at https://github.com/flathub/com.valvesoftware.Steam/issues/1072.
Closing in favor of the older issue report.
I have fixed this by hijacking the obsolete DBus calls made by Steam. Also involves punching holes into the sandbox: https://github.com/flathub/com.valvesoftware.Steam/issues/1072#issuecomment-3898393858
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Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist
When triggering the shutdown menu option in big picture mode the big picture mode turns black but nothing is happening. When running Steam using the commandline with
flatpak run com.valvesoftware.SteamI can see the following error when triggering the button:There is a steam dicsussion where someone mentions the issue as well:
https://steamcommunity.com/app/221410/discussions/2/3763354579678964105/
Steps for reproducing this issue: