https://bugs.kde.org/show_bug.cgi?id=507904
Bug ID: 507904
Summary: Panel and applets still apply background blur even
when panel set to opaque
Classification: Plasma
Product: plasmashell
Version First 6.4.3
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Panel
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
The panel and applet/widget popups like the application launcher and tray menu
still have their background blurred even when panel is set to opaque or
adaptive (and a window is maximized). This can be observed during animations
that involve fading in/out (opening widget popups) or manually decreasing
panel/popup opacity (eg. with Meta+Scroll set to Change opacity in window
action settings).
I don't know what optimizations are set in place by KWin for blur but this
sounds like unnecessary GPU usage if the blur is still being calculated but not
being useful because the surfaces are fully opaque.
STEPS TO REPRODUCE
1. Show Panel Configuration > Opacity > Adaptive/Opaque
2. Make sure panel is in opaque mode (Maximize a window if set to Adaptive)
3. Hover over widgets or open them to trigger some fade-in animations
Or alternatively, Meta+Scroll down on a panel or widget popup
OBSERVED RESULT
You can notice blur is still being applied behind the panel and its popups
implying blur is always active even when visually unnecessary or irrelevant.
EXPECTED RESULT
When the panel and its popups are opaque, disable background unnecessary blur.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
ADDITIONAL INFORMATION
May worsen performance or battery life on systems with integrated GPUs or on
battery power, especially if users chose to make the panel opaque just for this
reason while still keeping the global blur effect enabled for other more
meaningful windows.
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