Comment 21 for bug 531190

I think I have this problem too...
I've my AC cable unplugged and in gnome-manager it says that is charging.
Look at this:
$ upower -d
Device: /org/freedesktop/UPower/devices/line_power_ADP1
  native-path: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:09/PNP0C09:00/ACPI0003:00/power_supply/ADP1
  power supply: yes
  updated: Wed Jun 30 20:04:11 2010 (303 seconds ago)
  has history: no
  has statistics: no
  line-power
    online: no

Device: /org/freedesktop/UPower/devices/battery_BAT1
  native-path: /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:09/PNP0C09:00/PNP0C0A:00/power_supply/BAT1
  vendor: MSI Corp.
  model: MS-1221
  power supply: yes
  updated: Wed Jun 30 20:08:47 2010 (27 seconds ago)
  has history: yes
  has statistics: yes
  battery
    present: yes
    rechargeable: yes
    state: charging
    energy: 468.964 Wh
    energy-empty: 0 Wh
    energy-full: 619.569 Wh
    energy-full-design: 53.28 Wh
    energy-rate: 16.9608 W
    voltage: 27.692 V
    time to full: 8.9 hours
    percentage: 75.692%
    capacity: 75.2708%
  History (charge):
    1277924927 75.692 charging
    1277924897 68.812 charging
    1277924867 26.617 charging

Daemon:
  daemon-version: 0.9.1
  can-suspend: yes
  can-hibernate yes
  on-battery: no
  on-low-battery: no
  lid-is-closed: no
  lid-is-present: yes

I've a LG E500