I noticed this too, and I think it is a known issue. If you have a mini-display port monitor you can close the lid and the laptop screen "disappears" as it should, but not with displaylink - also if your laptop is set to sleep with lid shut, it will sleep if DL is connected, but not if external monitor via Mini-displayport or thunderbolt is connected.
Really to bad that DL is not the same as a physical external monitor.
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