I have been having a very similar problem. The percentage full reported
by gnome-power-manager was around 6-7% while the time remaining would be
at a reasonable 2-3 hours. I also noticed that "Energy when full" was
reported at 643 Wh (with "Energy (design)" at 50.2 Wh).
I see a similar discrepancy in the DevkitPower.txt attached by the
reporter:
energy-full: 1357.04 Wh
energy-full-design: 50.2 Wh
I found this: http://ubuntuforums.org/showthread.php?t=736347 --
david_edmundson advises the following for a similar symptom:
"It's a known hardware bug. Affects OS X too.
The fix is listed on Apples website somewhere.
Shutdown, take the battery out, and disconnect the mains. Then press and
hold the power
button for a while. Reassemble, and all will be good."
I did this, and now the numbers reported by gnome-power-manager are
reasonable. (energy-full at 51 Wh).
What I quoted above states that this is a hardware bug, but I haven't
gone any further to verify that.
--
[karmic] Battery fill level is off; system shutting down early
https://bugs.launchpad.net/bugs/485249
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