I'm using an Acer Aspire 1640 and experience the same problems with Edgy. The remaining percentage is at 0%, and I'm currently running on battery. Initially after unplugging the power cord, the system shut down. After a reboot it continues to operate at 0% power level, sometimes reporting 1 hour remaining (while still at 0%). As indicated above, acpi -t indicates the correct information, and I also had no such problems with Dapper. After an upgrade, and subsequent clean Edgy install to remove any artifacts of the upgrade, power management is still broken.
** Attachment added: "PM 0% indicator and acpi -t output." http://librarian.launchpad.net/4967356/pmbug.png -- Wrong battery levels (remaining_time) https://launchpad.net/bugs/66094 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs