I've just installed ubuntu 12.04 on a (old) Dell Inspiron 1520. When I unplug the AC power supply, the computer continues to run for up to 30 minutes, but no battery status indicator is displayed. In the System Settings>Power menu, it is set to display in the panel.
Additionally, no battery is detected by ubuntu in Power Statistics.
Thanks for any support/ideas you can give. I've been searching for several hours now...
(From looking at other threads, I thought it may be helpful to know:
-I only run on one factory DELL battery.
-the laptop's power indicator light comes on red when on battery power, but still runs for 30ish minutes.)