Well, I guess it's related to bug 220211 (and others from this list
https://bugs.edge.launchpad.net/ubuntu/+bugs?field.searchtext=lid&orderby=-datecreated)

Can you verify that the state is reported correctly, by checking the following 
command's output, when the lid button is pressed and when it isn't:
 cat /proc/acpi/button/lid/*/state

-- 
screen switches off when lid is reopened
https://bugs.launchpad.net/bugs/219916
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