Monitor hotplug events are not handled

[darksylinc]

LightDM (Xorg) does not handle monitor hotplug events.

Which means that if a monitor is unplugged lightdm still thinks it's on; and if a new monitor is plugged lightdm thinks it's off.

This is problematic because some monitors report themselves as unplugged when they're turned off.

Thus if lightdm starts before while the monitor is powered off (i.e. on startup or after resume from suspend) the screen will be black.

[Shirkanesi]

We've got a similar issue. A fix should be changing the tty with Ctrl+Alt+ and back again to lightdm. So we've currently deployed a hotfix using some udev-rules triggering chvt but I'm hoping for a proper fix :D