For the records, here's a screenshot (photo) of the system after a freeze. 
Series of actions to get there:
1. enable kernel debug output
2. detach external mouse, to verify that messages appear
3. hit enter to get a new prompt line
4. trigger the freeze with "lsusb -v"
lsusb prints the name of the device it's going to work with. Then nothing 
anymore.

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https://bugs.launchpad.net/bugs/1485057

Title:
  "lsusb -v" as root freezes the kernel on Acer ES1-111; also freeze on
  shutdown

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