This is not actually caused by LightDM - when you make the guest session
active (via logind) it doesn't appear to detect this and turn the screen
on.

To reproduce:
1. Login with your account normally.
2. Switch to guest session from the panel menu "Switch Account... -> Guest 
Session"
3. Switch back to your user account.
4. Find the guest session ID by running loginctl, i.e.
$ loginctl 
   SESSION        UID USER             SEAT            
        c4       1000 bob              seat0           
        c1        135 guest-4aZrXA     seat0           
5. Switch to the guest session, i.e.
$ loginctl activate c1

Observed result:
The screen is black until the mouse moves

Expected result:
The desktop is shown immediately

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https://bugs.launchpad.net/bugs/1405349

Title:
  switching to activated guest session causes screen blank

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