Subscribed ubuntu-kernel-acpi thinking that this might be a weird interplay between acpi and the gnome power manager.
Note: today, when I plugged in the AC power (as per above steps), a notification popped up but it disappeared so quickly I couldn't read it. It looked like the "battery is critical" notice (I saw the word "data" in there) but it was too quick... And the laptop didn't shut down. So, this still is occurring seldom. -- shutdown after plugging in AC with "critical battery" https://launchpad.net/bugs/70293 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
