I can confirm this as a bug on MSI ex600 laptop with the following:
acpi-0.09.3ubuntu1
linux-2.6.24.10.8
gnome-power-manager-2.21.92-0ubuntu1
The power manager does not report the remaining battery percentage.
however acpi -V and cat /proc/acpi/battery/BAT1/state shows correct info:
$ acpi -V
Battery 1: discharging, 88%, 02:10:40 remaining
Thermal 1: ok, 40.0 degrees C
AC Adapter 1: off-line
$ cat /proc/acpi/battery/BAT1/state
present: yes
capacity state: ok
charging state: discharging
present rate: 2151 mA
remaining capacity: 4153 mAh
present voltage: 12011 mV
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regression: Incorrect battery status reported on Acer laptops in edgy
https://bugs.launchpad.net/bugs/73266
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