Review Request 116481: Calculate remaining battery lifetime considering ALL installed batteries

[Joschi Brauchle]

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https://git.reviewboard.kde.org/r/116481/
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Review request for kde-workspace and Kai Uwe Broulik.


Bugs: https://bugs.kde.org/show_bug.cgi?id=253453
    http://bugs.kde.org/show_bug.cgi?id=https://bugs.kde.org/show_bug.cgi?id=253453


Repository: kde-workspace


Description
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Currently powerdevil uses the "time-to-empty" property provided by upower to add up battery life for all installed batteries. 
Unfortunately, upower 0.9.x does not provide a "time-to-empty" for fully charged batteries.
Hence, the remaining battery lifetime displayed by powerdevil considers only batteries which are currently being discharged and ignores all fully charged batteries.

The proposed patch is taken from upower 0.99.x and sums up the total energy available in all installed batteries (discharging and charged) and divides it by the current total discharge rate over all batteries (this is for lifetime, similarly for charge time).


Diffs
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  a/powerdevil/daemon/backends/upower/powerdevilupowerbackend.cpp eae5436 

Diff: https://git.reviewboard.kde.org/r/116481/diff/


Testing
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Tested with KDE 4.11.6 on Thinkpad T440s with 
- two batteries installed
- one battery installed


Thanks,

Joschi Brauchle

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