Comment 3 for bug 67081

This seems to be the issue in kernel/acpi/hal which reports strange remaining_time on some cases (in your case even insertion of CD).

> Worse, it forces hibernation when the battery still has
plenty of capacity left.

What is the level at this point in time? Is it below 50%? guidance-power-manager has CHARGE_LEVEL_THRESHOLD at 50%, which should prevent critical action if battery level is above 50%. I think this is a bit high (5-15% might be more appropriate), but I would like to confirm that you were below 50% when this happened (so that we know this threshold works).