If the systems have been restarted and the GDM user selection is active, the systems go into sleep mode after a certain time. This is a problem for the automatic installation in case of a slow internet connection or a large number of simultaneous installations.
That should satisfy the issue, doesn't it? If not, we could try more of the power settings mentioned here... But I think the screen going dark is alright.
If the systems have been restarted and the GDM user selection is active, the systems go into sleep mode after a certain time. This is a problem for the automatic installation in case of a slow internet connection or a large number of simultaneous installations.