I have a similar problem on my Hardy install.
Neither kpowersave nor guidance-power-manager report correct battery 
information. However, using the acpi command reports the correct state.
Restarting kpowersave of guidance-power-manager doesn't change the situation. I 
get the following messages when starting kpowersave, which seem to indicate the 
problem is dbus-related:
kpowersave: WARNING: Unknown error while aquire org.freedesktop.Policy.Power 
interface
kpowersave: ERROR: Could not send dbus message: Did not receive a reply. 
Possible causes include: the remote application did not send a reply, the 
message bus security policy blocked the reply, the reply timeout expired, or 
the network connection was broken.
kpowersave: WARNING: Property: power_management.can_standby for: 
/org/freedesktop/Hal/devices/computer doesn't exist.
kpowersave: WARNING: Property: battery.serial for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.charge_level.capacity_state for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.charge_level.unit for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Couldn't request charge_level.unit for udi: 
/org/freedesktop/Hal/devices/computer_power_supply_0
kpowersave: WARNING: Property: battery.charge_level.design for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.remaining_time for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.serial for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.charge_level.capacity_state for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.charge_level.unit for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Couldn't request charge_level.unit for udi: 
/org/freedesktop/Hal/devices/computer_power_supply_0
kpowersave: WARNING: Property: battery.charge_level.design for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.
kpowersave: WARNING: Property: battery.remaining_time for: 
/org/freedesktop/Hal/devices/computer_power_supply_0 doesn't exist.

-- 
kpowersave shows wrong battery status
https://bugs.launchpad.net/bugs/189805
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