Error "low battery" causes endless sleep loop

[tebeka]

Even though the battery has plenty of power (more than 50%), I get "battery critical" message and then the system sleeps. When it wakes up again the message is shown and the system goes to sleep ....

The only way to get out is either to connect to power source or restart the machine (and then the battery power is OK).

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: acpi (not installed)
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
Architecture: amd64
Date: Tue Sep 13 19:40:56 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: acpi
UpgradeStatus: No upgrade log present (probably fresh install)

[tebeka (miki-tebeka)]

This continues with 11.10.
For some reason I see *two* batteries in the battery indicator, one of them "not present". I have only one in my laptop.