[unity8][desktop] pressing PrintScreen sometimes locks Unity8

Bug #1649558 reported by dinamic
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Bug Description

ubuntu 17.04 fresh daily build install / intel sandy bridge

i've seen this bug countless times pressing PrintScreen sometimes locks Unity8, but i don't now how to trigger since only some times it happens. when locked you just see the last frame, mouse is frozen, nothing reacts, you can jumpt to tty (the keyboard still works)

unfortunetly i don't know how to trigger the bug or how to investigate further when it does happen

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