Hello everyone,I have the following problem with a Lenovo Thinkpad T440s laptop, but is looks like a much more general problem that affects may users (will provide bugzilla links later):
The are two batteries installed in this machine:
mo-thinkpad01:~ # upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: BAT0
vendor: SONY
model: 45N1111
serial: 12294
power supply: yes
updated: Fri 28 Feb 2014 09:37:25 AM CET (1202 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: fully-charged
energy: 23.2 Wh
energy-empty: 0 Wh
energy-full: 23.2 Wh
energy-full-design: 23.2 Wh
energy-rate: 0 W
voltage: 12.471 V
percentage: 100%
capacity: 100%
technology: lithium-polymer
mo-thinkpad01:~ # upower -i /org/freedesktop/UPower/devices/battery_BAT1
native-path: BAT1
vendor: LGC
model: 45N1127
serial: 4696
power supply: yes
updated: Fri 28 Feb 2014 09:57:25 AM CET (3 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
energy: 22.94 Wh
energy-empty: 0 Wh
energy-full: 24.75 Wh
energy-full-design: 23.48 Wh
energy-rate: 2.239 W
voltage: 12.51 V
time to empty: 10.2 hours
percentage: 92%
capacity: 100%
technology: lithium-ion
History (rate):
1393577845 2.239 discharging
1393577815 1.652 discharging
1393577785 1.690 discharging
1393577755 1.803 discharging
As you can see, only BAT1 is being discharged, whereas BAT0 stays fully
charged.
Thus, the "time-to-empty" flag is only available for BAT1 and clearly only displays the time to empty FOR THAT PARTICULAR battery, but not when using ALL batteries.
As a result, the current "time-to-empty" is basically a useless information for the user, as it ignores the second, fully charged and available battery.
Imagine the case where BAT1 = 5% charged and discharging and BAT0 = 100% fully-charged. Then upower will display something like ~5 minutes remaining battery life (because it ignores BAT0), but in reality the total lifetime of BAT0+BAT1 would be multiple hours.
Is this a known limitation?I would like upower to provide an additional "overall-time-to-empty" value using ALL batteries / energy sources installed.
Best regards, Joschi Brauchle -- Dipl.-Ing. Joschi Brauchle, M.S. Institute for Communications Engineering (LNT) Technische Universitaet Muenchen (TUM) 80290 Munich, Germany Tel (work): +49 89 289-23474 Fax (work): +49 89 289-23490 E-mail: [email protected] Web: http://www.lnt.ei.tum.de/
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