https://bugs.kde.org/show_bug.cgi?id=525406
Bug ID: 525406
Summary: System Monitor Sensor widget auto-scales temperature
graph to 0-5°C despite valid sensor readings
Classification: Plasma
Product: plasmashell
Version First 6.7.4
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: System Monitor widgets
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: 1.0
Created attachment 195885
--> https://bugs.kde.org/attachment.cgi?id=195885&action=edit
Widget result
DESCRIPTION
The System Monitor Sensor widget incorrectly auto-scales the Y axis of a
temperature graph.
The issue occurs when displaying both CPU and GPU temperature sensors in the
same chart. The widget correctly displays the current temperature values in the
legend, but the graph scale is rendered from 0°C to 5°C, making the chart
unusable.
The sensor readings themselves appear to be correct.
STEPS TO REPRODUCE
1. Add a new System Monitor Sensor widget to the desktop.
2. Configure the widget as a temperature chart using automatic Y-axis scaling.
3. Add a CPU temperature sensor and a GPU temperature sensor to the same chart.
OBSERVED RESULT
The widget correctly reports sensor values such as:
CPU: 58.3°C
GPU: 38°C
However, the chart Y-axis is rendered between 0°C and 5°C.
The graph area remains empty because the displayed scale does not match the
actual sensor values.
EXPECTED RESULT
The chart should automatically scale according to the actual sensor values and
display an appropriate range (for example around 30-70°C depending on current
temperatures).
SOFTWARE/OS VERSIONS
Operating System:
CachyOS Linux
KDE Plasma Version:
6.7.4
KDE Frameworks Version:
(please fill from Info Center)
Qt Version:
(please fill from Info Center)
ADDITIONAL INFORMATION
The issue persists after deleting and recreating the widget from scratch.
GPU temperature readings appear valid. For example:
nvidia-smi --query-gpu=temperature.gpu --format=csv
returns:
temperature.gpu
42
The widget itself also reports reasonable values for both CPU and GPU
temperatures.
A screenshot is attached showing:
- CPU temperature around 58°C
- GPU temperature around 38°C
- Y-axis limited to 0-5°C
which suggests that the sensor values are correct but the chart auto-scaling is
incorrect.
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