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Latitude E7440 black screen after undock

I'm experiencing a problem with multiple Latitude E7440 laptops. the issue is as follows

When I undock from a port replicator, the laptop screen goes black. The screen never returns to a usable state. I must turn off the laptop manually and power back on. This is not occurring 100% of the time but is occurring fairly often. I'm running the latest drivers and bios update.

 

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