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  • You don't happen to have any extraneous HIDs plugged into another USB port by any chance? Commented Nov 3, 2017 at 22:32
  • Seems to have happened before, e.g. superuser.com/questions/1254863/… .. No solution there. Commented Nov 3, 2017 at 23:11
  • @JdeBP you're right. I'm gonna try to understand the answer there and if it works mark it as duplicate. Commented Nov 4, 2017 at 3:13
  • @mozsalles I had a similar issue on my laptop, except that the NULs (^@) were triggered by folding the screen back too far — far enough to trigger a wmi event. After blacklisting the wmi modules, all was fine. Maybe your case is similar? Commented Nov 7, 2017 at 4:31