I also encounter random failures resuming from suspend on 14.04
("4.4.0-64-generic #85~14.04.1-Ubuntu SMP Mon Feb 20 12:10:54 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux"). Latitude E5570, fresh install (as of a
week ago). No blinking caps lock, though.

I just cycled through suspend-resume several times and it worked well,
so it's intermittent. I tried to switch to the first virtual terminal
(<Ctrl>-<Alt>-F1) and restart (<Ctrl>-<Alt>-<Del>) assuming it was just
the screen, but nothing happened, suggesting that it's not screen-
related. Haven't checked dmesg yet, though, but I will next time it
happens.

I also registered one "Unclaimed register detected after reading
register" event in /var/log/kern.log, but I don't believe it's related
as my machine froze a number of times this week, yet this event is
present in kern.log only once, 5 days ago.

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https://bugs.launchpad.net/bugs/1570484

Title:
  Resuming from suspend on Lenovo ThinkPad X1 Carbon 4th gen does not
  work reliably

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