Public bug reported:
Binary package hint: gnome-power-manager
Hello! I'm using Ubuntu Gutsy on a Dell Latitude Laptop, and I'm seeing
very weird behavior from the Power Manager, and (consequently, I think)
the battery-related behavior of the computer. Maybe someone can help me
trace the problem to its source.
A bit of history: The machine worked pretty much OK with Feisty; the
indicators in the PM worked OK, and the battery life was 1:30 to 2
hours, depending on what I'd be doing. Then Gutsy came up, and the new
PM with the learning behavior was enabled, there was a period when
battery life was very badly predicted. However, that got fixed after a
while. There was a change somewhere that (I think) created a bug in how
the readings were done (I think some of the graphs displayed other's
info), though it doesn't seem to be there now. Then I've went through a
period when I disabled the PM start-up (I was playing with the boot
process) for a few weeks, which might have annoyed it. Which gets us to
the current issue:
I'm seeing very weird readings in the Power History graphs:
The Estimated time history, for instance, keeps going down _after_
plugging the machine in. So does the charge history and the voltage
history. (The three graphs are very well correlated.)
The Charge time accuracy profile seems to have a very good opinion about
itself---the accuracy goes from zero to 100% before battery percentage
reaches 15% and stays there. However, the Charge time profile looks very
weird: it claims "no data" between ~8% and ~83% battery percentage, and
the "average time elapsed" is at zero between 20 and 80 percent. There
is a small bump around 5% and a larger one at 90-100%.
The Discharge time accuracy profile is at 100% between 50% and 100%, and
goes down to 10% before that. The "Discharge time profile" is very
weird: it looks very much like the Charge time profile (very well
correlated), but it claims valid data throughout.
The power behavior is weird, too. My estimated battery time is much less
than what the machine actually manages (ie, an hour or less instead of
1h30m), and I sometimes get a critical battery warning within 15 minutes
of unplugging (with a full battery). I'm not sure what to do about it.
Is there any way to reset PM's estimates about the machine and make it
re-learn it? (Also, might there be a bug in its estimators that I can
help trace?)
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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power management applet seems very screwy
https://bugs.launchpad.net/bugs/137951
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