ok dan, let's try this. type into a terminal the following command.
while it's running, close the lid of your laptop and open it again. see
if you got any "closed" or only "open"

for i in {1..10}; do cat /proc/acpi/button/lid/LID/state; sleep 1; done

-- 
No blank screen when laptop lid is closed
https://bugs.launchpad.net/bugs/293063
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