This new session class is to "user" what "background" is to "background-light": it doesn't cause the per-user service manager to start. This new session class is now the default if no session class was provided at session registration time and the following conditions hold: 1. The session is not graphical 2. The user is not a regular user (but not root) Or in other words root and system users won't get a service manager started automatically if they go through a PAM session as part of things like cron or ftp. They will however still get one if they log in graphically. This changes behaviour a bit, but hopefully in OK was. This also makes "background-light" for system users incl. root. This addresses one of the ideas discussed in #34988.
System and Service Manager
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