https://bugs.kde.org/show_bug.cgi?id=479856
Bug ID: 479856
Summary: Stylus input bug in applications ran under XWayland
Classification: Plasma
Product: kwin
Version: 5.24.7
Platform: Ubuntu
OS: Linux
Status: REPORTED
Keywords: wayland
Severity: normal
Priority: NOR
Component: platform-x11-nested
Assignee: kwin-bugs-n...@kde.org
Reporter: petra...@outlook.com
Target Milestone: ---
Created attachment 164920
--> https://bugs.kde.org/attachment.cgi?id=164920&action=edit
Input issue under XWayland (tested with Xournal++)
I'm experiencing input issues with certain applications that accept stylus
input when run under XWayland. For example, running Xournal++ on XWayland to
work around bug 424485 results in streaking that is quite noticeable my current
writing speed (see attachment: black is XWayland; green is native Wayland).
Steps to reproduce
1. Run 'GDK_BACKEND=x11 whatever (ex.: xournalpp)' in terminal
2. Start writing with stylus
Excepted behavior:
Strokes are clean and without streaking
Observed behavior:
New strokes have streaking at the start
Notes:
The issue does not present itself if XWayland applications are launched from a
GNOME session; Krita under XWayland seems to be immune to this problem for some
reason, even if launched from a Plasma session
Specs:
KDE Plasma: 5.24.7 under Wayland
KDE Foundation Libraries: 5.92.0
Qt version: 5.15.3
OS: Ubuntu 22.04.3
Linux kernel: 6.5.0-14-generic (64-bit)
CPU: Intel Celeron N4100 (4x @1.10GHz)
GPU: Intel UHD Graphics 600 (Mesa)
RAM: 5,6 GB
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