https://bugs.kde.org/show_bug.cgi?id=492159
Bug ID: 492159
Summary: System Monitor's "Charging Rate" always negative (when
charging or discharging)
Classification: Applications
Product: plasma-systemmonitor
Version: 6.1.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
SUMMARY
The System Monitor's charging rate is always a negative value, e.g.
- while discharging, the value is around -10W (correct)
- while charging, the value is around -36W (incorrect)
STEPS TO REPRODUCE
1. Open System Monitor
2. Add "Lithium Polymer Battery Charging Rate"
3. Observe values when the charger is disconnected/connected
OBSERVED RESULT
- While discharging, the value is around -10W (correct)
- While charging, the value is around -36W (incorrect)
EXPECTED RESULT
While charging, the value should reflect battery charge change, i.e. positive
if battery charge is increasing.
SOFTWARE/OS VERSIONS
(available in the Info Center app, or by running `kinfo` in a terminal window)
Operating System: Fedora Linux 40
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.6-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
I'm not sure how the System Monitor gets the values, but `upower` always shows
positive values with a "charging"/"discharging" note, e.g.:
While charging:
```
$ upower -i `upower -e | grep 'BAT'`
native-path: BAT0
vendor: SMP
model: L22M3PG5
serial: 1956
power supply: yes
updated: Sun 25 Aug 2024 13:11:00 CEST (2 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: charging
warning-level: none
energy: 50.19 Wh
energy-empty: 0 Wh
energy-full: 59.36 Wh
energy-full-design: 57 Wh
energy-rate: 29.948 W
voltage: 13.118 V
charge-cycles: 2
time to full: 18.4 minutes
percentage: 84%
capacity: 100%
technology: lithium-polymer
icon-name: 'battery-full-charging-symbolic'
History (charge):
1724584230 84.000 charging
1724584170 83.000 charging
History (rate):
1724584260 29.948 charging
1724584230 30.760 charging
1724584200 31.396 charging
1724584170 32.679 charging
```
While discharging:
```
$ upower -i `upower -e | grep 'BAT'`
native-path: BAT0
vendor: SMP
model: L22M3PG5
serial: 1956
power supply: yes
updated: Sun 25 Aug 2024 13:12:01 CEST (6 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 50.25 Wh
energy-empty: 0 Wh
energy-full: 59.36 Wh
energy-full-design: 57 Wh
energy-rate: 10.333 W
voltage: 12.587 V
charge-cycles: 2
time to empty: 4.9 hours
percentage: 84%
capacity: 100%
technology: lithium-polymer
icon-name: 'battery-full-symbolic'
History (charge):
1724584230 84.000 charging
History (rate):
1724584321 10.333 discharging
1724584290 0.000 pending-charge
1724584260 29.948 charging
1724584230 30.760 charging
```
Also, this seems to be similar to an existing problem reported in a discussion
by a KDE user in 2023:
https://discuss.kde.org/t/laptop-system-monitor-never-gives-charge-rate-0w-bug/332
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