https://bugs.kde.org/show_bug.cgi?id=449398
Bug ID: 449398
Summary: Non-Qt/KDE apps stutter / have rendering issues under
Wayland
Product: kwin
Version: master
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: rapiteanu.cata...@gmail.com
Target Milestone: ---
SUMMARY
When using Wayland with the Nvidia proprietary driver, all non-Qt/KDE apps
stutter to a point that makes them unusable. This is extremely visible when the
application does some playback (like playing a video in Firefox) or typing
something in a box (like the Matrix chat Element).
It seems that instead of rendering the next frame, for a split second the
previous frame is being rendered and only then the correct frame is being
drawn. For example, if you have in a text box the word "hell", when you type
the last "o", sometimes, the word drawn will be "hel" and only a bit afterwards
you will see the full "hello" word.
STEPS TO REPRODUCE
1. Start a Wayland session with the Nvidia proprietary driver.
2. Start any type of non-Qt/KDE application (like Element chat).
3. Type a message.
OBSERVED RESULT
The rendered frames are not sequential.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Plasma master (Wayland session)
KDE Plasma Version: 5.23.90 master
KDE Frameworks Version: 5.91 master
Qt Version: 5.15.2
Video Driver: nvidia 495.46, egl-wayland 2:1.1.9-master, xorg-xwayland master
21.1.2.901.r270
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