Apropos vt switch, I believe, thats the root cause of this issue and the
blank-after-unlock bug. If we have a vt switch (e.g. "sleep 20 &&
loginctl activate cX" in the examples above) *after* the lid was closed,
then the system suspends; maybe because the new session has no inhibitor
lock. When the lid is open, the screen gets turned on for the new active
session. When we switch back to the original session, the screen turns
off, because on this sessions it was deactivated, but never reactivated.

I've tested this behavior on text vt's and there is the same retroactive
suspend reaction of a closed lid.

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https://bugs.launchpad.net/bugs/1307545

Title:
  Power Manager settings are ignored when closing laptop lid

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