Please report more about your system, what laptop brand and model.
When this next time occur, login to laptop using ssh and attach following 
output to bug report.
Attaching "dmesg | tail"  and /var/log/Xorg.0.log

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[Intrepid Beta] Have to Restart X11 for keyboard to work after unplugging 
powercord on laptop
https://bugs.launchpad.net/bugs/285162
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