Ubuntu
upower package

  1. Bug #531190
  2. Comment #6

Comment 6 for bug 531190

Revision history for this message
In , Michael Biebl (mbiebl) wrote :

Immediately after AC unplug, upower is showing incorrect numbers for remaining time.
In my particular case, the battery is fully charged, I then unplug, and g-p-m pops up a dialog, saying that I have 3 minutes left before my battery is empty (which is obviously bogus). After a short period of time (usually a matter of 30+ secs), the values reported by upower are correct.

This might actually be a kernel/hardware problem, reporting incorrect current_now values (as shown in the referenced downstream bug reports [1][2])

Nonetheless, upower should probably workaround this by either:
a/ having some sanity checks to ignore unreasonable high/low (static) values
b/ ignore current values for say 60secs after ac unplug
c/ compute the mean values for properties like current_now and filter values which exceed a certain ratio
d/ other ideas?

Please also see the relevant downstream bug reports:
[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=571161
[2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574850