https://bugs.kde.org/show_bug.cgi?id=510239
Bug ID: 510239
Summary: Increase GPU usage when clock display updates while
Panel visibility is hidden
Classification: Plasma
Product: plasmashell
Version First 6.4.5
Reported In:
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Digital Clock widget
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
Created attachment 185513
--> https://bugs.kde.org/attachment.cgi?id=185513&action=edit
idle iGPU usage corresponding to minute clock updates
SUMMARY
While the start bar or `Panel` visibility is hidden, idle iGPU usage spikes
from 0% to a sustained ~10% whenever the widget for the `Digital Clock` updates
the current time. For example, until the Panel is made visible via some user
interaction via mouse or keyboard, the `plasmashell` process spikes idle iGPU
usage spikes to a sustained ~10% upon any advancement of the current minute of
the day, or second of the day if the Digital Clock is configured to always show
seconds.
STEPS TO REPRODUCE
1. Add Digital Clock to Panel
2. Set Panel visibility to `Always visible`
3. Use `nvtop` to view idle iGPU usage baseline
4. Set Panel visibility to `Auto hide`
5. Wait for wall time to advance to next minute
OBSERVED RESULT
iGPU usage spikes in sync with clock updates.
EXPECTED RESULT
Visibility of Digital Clock should not greatly affect idle iGPU usage.
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.11
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.9 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor 1: Intel® HD Graphics 530
Graphics Processor 2: NVIDIA GeForce GTX 960M
Manufacturer: Dell Inc.
Product Name: XPS 15 9550
ADDITIONAL INFORMATION
Issue persists with or without Nvidia drivers installed.
I.e. even when only the Intel iGPU is loaded by kernel.
I suspect this may be a bigger issue than just the digital clock, and more to
do with the general update events and display rendering. As when screen
recording this issue (from my dGPU), my idle iGPU usage would only flatline
when I hovered over the panel to focus it's visibility in view, but would hold
at ~10% when hidden.
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