More more experimentation:

1. Wrote a test script (attached) that grabbed the output of
/proc/acpi/battery in a loop then pulled the power plug. Never was
actually able to capture the discharge event.

2. I found that:

 * If I boot the machine with AC attached, then pull the power plug the system 
will suspend.
 * If I boot the machine from battery (no AC attached), then pull the power 
plug the system will *not* suspend or just work as expected.

I've attached the output of:

grep -r . /proc/acpi/battery

from the case where the system was booted on AC and one where the system
was booted on battery.


** Attachment added: "batt-test.sh"
   http://launchpadlibrarian.net/31110032/batt-test.sh

-- 
System Suspends/Hibernates when AC is unplugged
https://bugs.launchpad.net/bugs/421985
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