[Goodies-dev] [Bug 8594] New: current_now may contain useful negative rates while discharging

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=8594

          Priority: Medium
            Bug ID: 8594
          Assignee: frivoal at xfce.org
           Summary: current_now may contain useful negative rates while
                    discharging
        QA Contact: goodies-dev at xfce.org
          Severity: normal
    Classification: Panel Plugins
                OS: Linux
          Reporter: xfce_bugzilla at shandschuh.de
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: General
           Product: Xfce4-battery-plugin

Some battery drivers are reporting a negative rate in
/sys/class/power_supply/BAT0/current_now (replace BAT0 with your battery) such
as the bq27x00-battery driver and the kernel for the toshiba ac100 (tegra 2
soc). In the two cases, the current_now contains a useful rate (i.e. no error
code).

A negative rate in current_now however, is interpreted by the
xfce4-battery-plugin as an error such that remaining time is not displayed
correctly.

This could be fixed by adding abs() panel-plugin/libacpi.c around line 793
together with considering the value -1000 as a not present rate.

The upower-daemon, for instance, also applies abs() to this value.

AFAIK, the acpi specification does not allow negative rates but int the linux
power supply class documentation, there seems to be currently no statement
about the sign.

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