https://bugs.kde.org/show_bug.cgi?id=505887
Bug ID: 505887
Summary: Enabling titlebar blur in Klassy prevents direct
scanout
Classification: Plasma
Product: kwin
Version First 6.4.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: ye.jingc...@gmail.com
Target Milestone: ---
SUMMARY
After enabling "Blur titlebars that have transparency" in Klassy Window
Decoration settings, (with Blur effect in System Settings enabled), full screen
window can no longer trigger direct scanout.
STEPS TO REPRODUCE
1. Enable "Show Compositing" in System Settings > Windows Management > Desktop
Effects
2. Also enable the "Blur" effect
3. Install Klassy[1] and enable it in Window Decorations
4. Open Klassy's setting, Open Titlebar tab > Titlebar Opacity
5. Set both transparency to 80%, and check "Blur titlebars that have
transparency" below, click apply
6. Full screen a window (MPV or F11 in browsers)
[1] https://github.com/paulmcauley/klassy/
OBSERVED RESULT
The compositing indicator still displays
EXPECTED RESULT
The compositing indicator should disappear.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics
Memory: 16 GiB of RAM (14.9 GiB usable)
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: HP EliteBook 845 14 inch G9 Notebook PC
ADDITIONAL INFORMATION
I am not quite sure whether this is in kwin or klassy, but blur effect in
background window probably should not prevent direct scanout?
Also, the problem does not go away by simply switching back to Breeze
decoration. I have to disable and re-enable Blur effect to make compositing
indicator to disappear for full screen window.
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