I reproduced this bug (once only) by doing the following:

1. I ran xev.

2. I did the key combination for 'brightness down'. The brightness
dimmed but xev reported a continuous series of 101 key press / release
events. This keycode 101 is listed at
https://wiki.ubuntu.com/KubuntuLaptopKeycodes as being the brightness
down key for some Dell laptops like mine.

3. I did the key combination for 'brightness up'. The brightness
increased and xev reported a single key press / release combination for
key code 212. The stream of 101 keycodes stopped.

After step 3, the key modifiers all work.

However, I haven't been able to make it happen again. Brightness down
normally generates no key events as far as xev is concerned (although
the brightness does dim) and brightness up generates a single press /
release sequence for keycode 212.

So might the bug be related to the brightness controls? Note bug 188775,
where X changes the screen brightness at random intervals for some
users. I haven't noticed that bug on my system for a while now, but X
now also rarely forgets key modifiers - it seems to happen after resume
or in the 'brightness down' sequence in step 2 above.

-- 
[hardy] keyboard modifiers randomly forgotten
https://bugs.launchpad.net/bugs/190934
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