https://bugs.kde.org/show_bug.cgi?id=430525
Bug ID: 430525
Summary: Magic Lamp is stuttering when another window is open
Product: kwin
Version: 5.20.4
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: leledumbo_c...@yahoo.co.id
Target Milestone: ---
SUMMARY
I think this is better described as a video: https://youtu.be/bDFsksynmKk
tl;dr:
* standalone window -> effect is smooth
* another window behind -> effect is stuttering
STEPS TO REPRODUCE
1. Enable Magic Lamp effect, optionally Show FPS as well
2. Open two apps, preferably KDE apps (shouldn't matter, but just in case)
3. Minimize both
4. Start maximizing/minimizing one with the other stay minimized
5. Maximize the other
6. Start maximizing/minimizing again with the same window from step 4
OBSERVED RESULT
With Show FPS, at step 4 the fps only goes down by 10 or so and only at the
first or second minimize. The subsequent application is stable at highest
reachable fps. Visually, the animation is very smooth like there's no frame
skipping.
At step 6, the fps goes down by up to 30 with 20-ish average and it stays so
subsequently. Visually, the animation is like there are skipped frames so the
smoothness is much less.
EXPECTED RESULT
Step 6 should have the same performance as step 4.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro with 5.9.11-3 kernel
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
* CPU/GPU: i7-7700HQ/Intel UHD 620
* KWin MaxFPS: 144
Compositor:
* Scale method: Crisp
* Rendering backend: OpenGL 3.1
* Vsync: auto
* Allow application to block compositing: ✓
Other enabled desktop effects:
* Accessibility: Zoom
* Appearance: Background contrast, Blur, Desaturate Unresponsive Applications,
Fading Popups, Full Screen, Login, Logout, Maximize, Morphing popups, Screen
Edge, Sheet, Sliding popups, Translucency, Wobbly Windows
* Focus: Dialog Parent, Dim Inactive, Dim Screen for Administrator Mode, Slide
Back
* Show Desktop Animation: Window Aperture
* Virtual Desktop Switching Animation: Desktop Cube Animation
* Window Management: Desktop Cube, Present Windows, Resize Window
* Window Open/Close Animation: Glide
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