Starting xev and placing my mouse in it before suspend, then watching
what happens on keypresses after resume, what I see is that after some
resumes, if the first key I press is the left control key, I see that
reported as *two* KeyPress events, the first for Control_R, the second
for Control_L.  Thereafter it reports key events as if the control key
were held down (regardless of whether it is).  If I press and release
the right control key, the keypress is ignored, but the release is
reported.  Therefore pressing the right control key is a workaround that
clears the problem.

-- 
control key "stuck" after resume on Dell 1420n
https://bugs.launchpad.net/bugs/213988
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