This behavior appears for me using XUbuntu 16.04 after unlocking the screen 
with Intel graphics.
Like the recently fixed bug where the mouse cursor disappears after unlocking, 
I observed a similar behavior to the num lock and caps lock key leds described 
in this bug report.
After unlocking you have to press the num lock OR(!) caps lock key twice to get 
the leds back in the correct state.
related bug:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1568604

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https://bugs.launchpad.net/bugs/1250186

Title:
  Neither CapsLock nor NumLock feedback is sent to led when state
  changes (e.g. by other keyboard)

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