I'm also seeing the same behaviour. Specifically, the power level shown on the systray icon doesn't always update as the battery discharges. A power event (connecting/disconnecting AC power) causes the power level to be updated to the correct level.
Let me know if you'd like me to provide anything and/or do some debugging. -- powermanager icon sometimes shows fully charged when not https://launchpad.net/bugs/64978 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
