cannot resume from hibernation when on AC power but low on battery

[Gioele Barabucci]

If my laptop hibernates because the battery is about to run out of power and I plug in the adapter, Ubuntu will refuse to resume correctly from hibernation.

What happens is this

1. get a warning for low battery
2. ignore the warning :)
3. laptop hibernates
4. plug in the adapter, laptop is now charging
5. power on the laptop
6. laptop start resuming from hibernation

What happen now is the bug I am reporting

7. after few seconds the computer goes back into hibernation

If I let the battery charge for a while (let's say 10 minutes), the computer resumes from hibernation without any problem.

I think the problem is that the battery still reports a low power level because is has been charged for only few seconds. This makes the application that overviews the battery level (gnome-power-manager?) think that it is time to hibernate. If this is the problem, them the application should be fixed to never hibernate if the laptop is on AC power, regardless of the battery level.