Comment 1 for bug 359147

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Alberto Milone (albertomilone) wrote : Re: Automatically enable mirroring for projectors

What you're asking hasn't been implemented yet. It involves using KMS (kernel mode setting) and sending events when a cable is plugged in (i.e. interrupt-driven hotplug). Currently these events exist but are sent only when you probe hardware manually (i.e. there's no auto probing). Furthermore, even when all this is implemented there will be a limitation because not all ports (e.g. some vga or tv ports) support hotplug.

Once interrupt-driven hotplug is implemented we'll be able to do what you say when we receive the event.