Public bug reported:

Assume that "Suspend when inactive for" values in "System Settings /
Power" are set to "5 minutes" and "Don't suspend" for columns "On
battery power" and "When plugged in".

Now assume that the system has been plugged in and inactive for 6
minutes.

Finally, assume that the system becomes unplugged.

In Ubuntu 14.04, the system does not suspend.  The 5 minute countdown to
automatic suspend begins when the unplug event occurs, such that the
timeout event occurs 5 minutes later.

This behavior is correct.

In Ubuntu 14.10, the system automatically suspends immediately after the
unplug event occurs.

This behavior is incorrect.

Or minimally, this behavior is undesired in the normal case.  The 5
minute timeout was intended to protect against battery energy being
drained during a continued period of the system being inactive AND
unplugged.  In this case, in contrast, the period of the system being
unplugged just began.  There has been no continued period of the system
being inactive AND unplugged.

This difference represents a regression in functionality for the 14.04
to 14.10 upgrade.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1415653

Title:
  14.10 incorrect suspend when inactive logic

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