https://bugs.kde.org/show_bug.cgi?id=499612
Bug ID: 499612
Summary: Screen freezes briefly when starting Element
Classification: Plasma
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: jpe...@petsovits.com
Target Milestone: ---
SUMMARY
Starting Element, the semi-official Matrix client, seems to cause a full stop
on compositing the desktop for a short while. Both the mouse pointer and
unrelated window contents will freeze for a few seconds.
Now my ThinkPad is ~5 years old and I'm running debug builds of everything, so
it's possible that a regular user will experience a shorter interruption.
Still, starting a program should not cause frame skips in other programs, let
along drag down the desktop for a prolonged amount of time.
STEPS TO REPRODUCE
1. Load an infinite CSS animation in your favorite browser, e.g.:
https://codepen.io/ykadosh/pen/XWBKjEV
2. Start Element. (On my system, this will still reproduce on repeated app
starts.)
3. Keep moving the pointer moving until Element's main window appears.
OBSERVED RESULT
While starting the app, both the CSS animation and the mouse cursor will freeze
until the window appears.
EXPECTED RESULT
No freezes ever.
SOFTWARE/OS VERSIONS
Element version: 1.11.90
Crypto version: Rust SDK 0.8.0 (21f7cc7), Vodozemac 0.8.1
KWin version: bea7cdac8f24b0320becb53edb9078fd35cb2128 (master branch from Feb
1, 2025, close to the 6.3.0 release date)
Operating System: Arch Linux
KDE Plasma Version: 6.3.80
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.1
Kernel Version: 6.12.10-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-8565U CPU @ 1.80GHz
Memory: 15.3 GiB of RAM
Graphics Processor: Intel® UHD Graphics 620
Manufacturer: LENOVO
Product Name: 20QD001VUS
System Version: ThinkPad X1 Carbon 7th
ADDITIONAL INFORMATION
Debug build of kwin, Plasma Desktop/workspace and dependencies, KF6, but not Qt
which comes from standard (release -build) Arch packages.
Regular KDE software such as Kate or Konsole, or even non-KDE software such as
Webcord (using Electron), seem to cause no noticeable freezes on startup. I've
really only seen Element do this to KWin so far.
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