>From Peter's description of the problem I guessed that it was wireshark
setting promiscuous state on the virtual usbmon interface that caused
the keyboard to go back to working state, which I knew should also be
possible via tcpdump -i usbmon3 where usbmon3 is the interface that
corresponds to the usb device in question.

This works as a short term hack.

sudo modprobe usbmon && sudo tcpdump -i usbmon3

Then you will be able to use the keyboard to ctrl-c out of it. Once the
state has been set it appears to be permanent and persistent until next
reboot.

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https://bugs.launchpad.net/bugs/1720842

Title:
  USB Keyboard "Masione VMJ-02" ID 1c4f:0056 SiGma Micro: Ctrl / Super /
  Alt incorrectly recognized as L-Shift

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