https://bugs.kde.org/show_bug.cgi?id=487332
Bug ID: 487332
Summary: Delayed rendering of typed characters and lost key
presses in terminal windows
Classification: Plasma
Product: kwin
Version: 5.27.11
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: fo...@protonmail.com
Target Milestone: ---
Created attachment 169681
--> https://bugs.kde.org/attachment.cgi?id=169681&action=edit
Slow rendering
SUMMARY
When typing in a terminal window (specifically with foot), there is a
noticeable delay before the typed characters are rendered on the screen. The
delay is more pronounced when resizing the terminal window, such as when
adjusting a tmux pane. Additionally, I have observed that sometimes the
backspace key press is not registered, resulting in characters not being
deleted. This is evident in the Wayland debug logs, where the backspace key
press only generates a release event (wl_keybo...@20.key(129094, 261421545, 14,
0)) without a corresponding press event.
I have reported it to foot author who concluded that the issue is probably with
the compositor. Here's the issue https://codeberg.org/dnkl/foot/issues/1705
STEPS TO REPRODUCE key not being registered
1. Install foot
2. Type a string
3. Try to remove a character. Sometimes it will not do it.
STEPS TO REPRODUCE delayed rendering
1. Install foot
2. Either launch a tmux with several panes and a program like htop running or
simulate some constant output and try to resize the window.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 39
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12
Kernel Version: 6.8.8-200.fc39.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700G with Radeon Graphics
Memory: 23,3 GiB of RAM
Graphics Processor: AMD Radeon Graphics
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