How should I diagnose "no voltage values" issues?

[Timothée Ravier]

Hi,

I'm running an updated Arch Linux with Linux 3.10 / 3.11rc7, upower 0.9.21.

My logs are filled with those lines:

upowerd[927]: (upowerd:927): UPower-Linux-WARNING **: no voltage values,
using 10V as approximation

which I've tracked back to be about
/org/freedesktop/UPower/devices/battery_BAT0 (the only battery available
on my laptop) using the patch I sent earlier on the list.

I'm now stuck as I've no idea on the next step to fix this warning. Is
it upower related or something to fix in the kernel ?

Here is a "upower --dump":
Device: /org/freedesktop/UPower/devices/line_power_ADP1
  native-path:
/sys/devices/LNXSYSTM:00/device:00/ACPI0003:00/power_supply/ADP1
  power supply:         yes
  updated:              Sun Aug 25 20:14:41 2013 (65588 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    online:             yes

Device: /org/freedesktop/UPower/devices/battery_BAT0
  native-path:
/sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
  vendor:               Sony Corp.
  power supply:         yes
  updated:              Mon Aug 26 14:27:22 2013 (27 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               charging
    energy:              9.74 Wh
    energy-empty:        0 Wh
    energy-full:         48.37 Wh
    energy-full-design:  54.83 Wh
    energy-rate:         19.44 W
    time to full:        2.0 hours
    percentage:          20.1364%
    capacity:            88.2181%
    technology:          lithium-ion

Daemon:
  daemon-version:  0.9.21
  on-battery:      no
  on-low-battery:  no
  lid-is-closed:   no
  lid-is-present:  no
  is-docked:       no

Cheers,

Tim