registry team mailing list archive

[Leif Walsh <leif.walsh@xxxxxxxxx>]

Brian: I am using the patched upower and friends from your PPA, and I
have a regression: the estimated time is frequently calculated
incorrectly, due to an incorrect calculation of the current.  For
example, in typing this comment, I watched as three notifications went
by, all saying "laptop battery low" and reporting the battery at 5%, but
in order, they reported estimated remaining times at 0:12, 0:06, and now
0:20.  My power usage has not changed significantly during this period.
I believe this is due to a sampling error, though I haven't looked at
the patch so I can't say how often it really occurs or exactly how to
fix it.  In most cases it is fine though, so thank you for the work, but
I think it needs further review and testing before it is merged into
mainline.  Furthermore, Intel's powertop gets the current correctly 100%
of the time, maybe it is worth looking in to how they calculate it.

Also, I can say for certain that my device used to properly report
current_now, in fact, I had scripts that used this value before and they
worked perfectly.  I wish I could say with certainty when this
regression occurred, I expect it was due to a kernel update.  I know it
worked some time after I upgraded to maverick, but before I started
using the 2.6.36 kernel from kernel-mainline (because that was supposed
to fix the extra load balancing ticks, which it didn't really do,
sadly).  I don't expect that this is the issue though, since so many
others see this bug that are probably not using the 36 kernel.  I hope
to do more investigation in the future.

-- 
You received this bug notification because you are a member of Registry
Administrators, which is the registrant for gnome-power.
https://bugs.launchpad.net/bugs/629258

Title:
  Battery life estimation never comes around