Regardless of battery charge, when unplugged Ubuntu displays critical battery message and hibernates. I can only seem to change it to either shutdown or hibernate.

This does not happen when using windows 7 on the same computer. Windows 7 gives a good few hours on a full charge indicating that it is not a battery problem.

Any help? I really don't want to have to use windows but its kinda pointless having a netbook that doesn't work when not plugged in!

I'm using a toshiba nb250 and the most up to date 11.10 ubuntu distro. I use to get the critical battery message before on the previous ubuntu but it never shut down or hibernated my computer.