Possible Soloution
I have a Lenovo W520. I had the same errors whenever I reboot or change status like unplugging and plugging power back in. It was the DisplayLink drivers that had been updated. I use a ThinkVision LT1421 Travel Monitor and I had to revert to version 6.2 from April. All is working well now. Lenovo uses the same technology for the port replicators as well. Hope this helps somebody.
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