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I have a similar issue.

Sometimes, but not every time, when I turn on a particular halogen lamp using the same outlet as a particular computer, it triggers USB detection and I get kernel messages on /dev/console as if I was plugging in a USB device.

This is a BSD kernel.

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Now, if you had some kind of home automation switching the lights you could implement a really slow communication protocol as a USB device driver.

This was happening to me, there was some problem with the electricity in my apartment. I can't recall what the electrician said, there were some switches that only 1/4 were working, and if 2/4 had been it would have fried everything. They fixed it in about an hour.

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