I had the same issue on an Acer Aspire One with a fresh Lubuntu 17.10.1 install. Trying to prevent the system from continuously going to sleep I set "HandleSuspendKey" and "HandleLidSwitch" to ignore in /etc/systemd/login.conf. After that the screen problem appeared.
When I commented out the HandleSuspendKey again, everything worked fine!
I had the same issue on an Acer Aspire One with a fresh Lubuntu 17.10.1 install. Trying to prevent the system from continuously going to sleep I set "HandleSuspendKey" and "HandleLidSwitch" to ignore in /etc/systemd/ login.conf. After that the screen problem appeared.
When I commented out the HandleSuspendKey again, everything worked fine!
Hope that helps