https://bugs.kde.org/show_bug.cgi?id=504617
--- Comment #1 from Ingemar <reach.inge...@gmail.com> ---
Title:
High CPU usage when Panel set to “Hide Automatically” in Plasma — panel edge
pixel triggers redraw
Product: Plasma Workspace
Component: KWin / Panel
Version: Plasma 6.3.5, KWin 6.3.5
OS: Arch Linux (kernel 6.14.7-5-cachyos)
Summary:
When the desktop panel is configured to “Hide Automatically,” CPU usage spikes
from under 2% idle to around 12–15%. The issue appears related to a 1-pixel
strip of the panel remaining visible at the screen edge, causing KWin to
continuously redraw or poll input events.
Steps to Reproduce:
Set Panel style to “Hide Automatically”
Observe CPU usage at idle with e.g., top or htop
Workarounds include:
Pressing the Meta key (opening and closing the app launcher) resets CPU
usage to normal
Cloning the current panel, placing it elsewhere, then deleting the
original also resets the condition
Expected Result:
Panel hides fully without leaving a visible pixel strip, and CPU usage stays
low when idle.
Actual Result:
A tiny visible pixel strip triggers continuous compositor activity and high CPU
usage.
Additional Notes:
Occurs consistently on Arch Linux with Plasma/KWin 6.3.5 and kernel
6.14.7-5-cachyos.
Suspect compositor or panel hiding logic does not fully hide the panel or
fails to notify KWin of state changes.
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