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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https://bugs.launchpad.net/lightdm/+bug/1405349/+subscriptions
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