For those of you with a Samsung laptop showing this problem, please see
this issue:
https://bugs.launchpad.net/ubuntu/+source/acpi/+bug/971061
in particular my last two posts.
I think a kernel patch can be made to flush the events (LID, AC
plug/unplug, etc) from the Embedded Controller, at resume, in the same
way that I do it with my C program that I attached to that issue for
Samsung laptops (and maybe others with the problem).
TL;DR: If the events don't get flushed (queried), the GPE of the EC is
never triggered again (chicken and egg situation), my little program
queries the events and "unstucks" the EC immediatly.
After that, LID and AC plugged events are reported normally.
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https://bugs.launchpad.net/bugs/1027368
Title:
[Samsung NP530U3B-A01UK] Laptop does not suspend on lid close
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