Mir

Handling session tracking with a system compositor

Registered by Chris Halse Rogers

Logind currently assumes that each local session lives on a unique VT. We break this - each session under unity-system-compositor lives on the same VT, and longer term we'll disable VTs entirely. We need to patch LightDM to patch, extend, or supplant logind.

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We've currently got a bunch of hacks to make logind marginally work with u-s-c - we set the XDG_SEAT and XDG_VTNR environment variables manually, and this fools logind enough to set the device ACLs for the session.

As soon as we support user switching this will fail - logind will get confused as to which session is active.

It's not clear to me why LightDM isn't in charge of session tracking and switching; perhaps long term it should be. For now we need to support mixed VT and unity-system-compositor sessions, so we'll need to hook up LightDM and logind so that logind tracks the sessions and delegates to LightDM for everything else related to the system-compositor sessions.

(?)

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