https://bugs.kde.org/show_bug.cgi?id=505232
Bug ID: 505232
Summary: KWin compositor freezes for seconds on Intel Arc (xe
driver) when opening, closing and every 10-30 seconds
on X11-forwarded application
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: X11 Integration
Assignee: kwin-bugs-n...@kde.org
Reporter: ngo...@gmail.com
Target Milestone: ---
SUMMARY
The KWin compositor freezes for 1-3 seconds when a GUI application forwarded
from a Docker container over X11 is closed. The freeze is visible during the
closing animation. The system recovers on its own. The issue does not happen
under GNOME with Mutter, confirming it is a KWin-specific bug.
This happens in both wayland and xorg.
STEPS TO REPRODUCE
1. Run Fedora 42 on a system with Intel Lunar Lake graphics (xe driver).
2. Start a Docker container that has a GUI application (e.g., Exegol with
burpsuite or firefox).
3. Launch the GUI application from the container's terminal (burpsuite &) so
its window appears on the host KDE desktop via X11 forwarding.
4. Move mouse around and click around GUI elements or close the application
window by clicking the 'X' button.
OBSERVED RESULT
The whole window and entire desktop (including mouse cursor) freezes for 1-3
seconds. The window begins its closing animation, then the entire desktop
(including the mouse cursor) freezes for several seconds. The system then
unfreezes.
EXPECTED RESULT
GUI works without freezing or The window closes smoothly with a normal
animation.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.9-300.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ Ultra 7 258V
Memory: 30.8 GiB of RAM
Graphics Processor: Intel® Graphics
ADDITIONAL INFORMATION
journalctl -f output
Jun 05 20:10:59 fedora ghostty[10763]: warning(gtk): unimplemented
action=apprt.action.Action.Key.cell_size
Jun 05 20:10:59 fedora ghostty[10763]: info(io_exec): started subcommand
path=/bin/bash pid=12747
Jun 05 20:10:59 fedora ghostty[10763]: info(io_exec): subcommand
cgroup=/user.slice/user-1000.slice/user@1000.service/app.slice/app-ghostty-transient-10763.scope/surfaces/2CF67510.scope
Jun 05 20:10:59 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=0 new=16
Jun 05 20:10:59 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=16 new=27
Jun 05 20:11:01 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=27 new=43
Jun 05 20:11:02 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=43 new=238
Jun 05 20:11:02 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=238 new=360
Jun 05 20:11:02 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=360 new=543
Jun 05 20:11:03 fedora ghostty[10763]: info(stream): OSC 1 (change icon)
received and ignored icon=/workspace
Jun 05 20:11:03 fedora ghostty[10763]: warning(stream): unimplemented OSC
command: change_window_icon
Jun 05 20:11:03 fedora ghostty[10763]: warning(io_handler): OSC 7 host must be
local
Jun 05 20:11:05 fedora ghostty[10763]: info(stream): OSC 1 (change icon)
received and ignored icon=burpsuite
Jun 05 20:11:05 fedora ghostty[10763]: warning(stream): unimplemented OSC
command: change_window_icon
Jun 05 20:11:05 fedora ghostty[10763]: info(stream): OSC 1 (change icon)
received and ignored icon=/workspace
Jun 05 20:11:05 fedora ghostty[10763]: warning(stream): unimplemented OSC
command: change_window_icon
Jun 05 20:11:05 fedora ghostty[10763]: warning(io_handler): OSC 7 host must be
local
Jun 05 20:11:05 fedora ghostty[10763]: info(grid): reallocating GPU buffer
old=543 new=817
Jun 05 20:11:05 fedora kwin_wayland[8839]: kf.windowsystem: static bool
KX11Extras::mapViewport() may only be used on X11
Jun 05 20:11:07 fedora kwin_wayland[8839]: kf.windowsystem: static bool
KX11Extras::mapViewport() may only be used on X11
Jun 05 20:11:10 fedora kwin_wayland[8839]: kf.windowsystem: static bool
KX11Extras::mapViewport() may only be used on X11
Jun 05 20:11:13 fedora kwin_wayland[8839]: kwin_wayland_drm: The main thread
was hanging temporarily!
Jun 05 20:11:20 fedora kwin_wayland[8839]: kf.windowsystem: static bool
KX11Extras::mapViewport() may only be used on X11
Jun 05 20:11:24 fedora kwin_wayland[8839]: kwin_wayland_drm: The main thread
was hanging temporarily!
Jun 05 20:11:28 fedora kwin_wayland[8839]: kwin_wayland_drm: The main thread
was hanging temporarily!
Jun 05 20:11:32 fedora kwin_wayland[8839]: kwin_wayland_drm: The main thread
was hanging temporarily!
Jun 05 20:11:37 fedora kwin_wayland[8839]: kwin_wayland_drm: The main thread
was hanging temporarily!
Jun 05 20:11:42 fedora kwin_wayland[8839]: kwin_wayland_drm: The main thread
was hanging temporarily!
Graphics:
Device-1: Intel Lunar Lake [Intel Arc Graphics 130V / 140V] driver: xe
v: kernel
Device-2: Chicony Integrated Camera driver: uvcvideo type: USB
Display: wayland server: X.org v: 1.21.1.16 with: Xwayland v: 24.1.6
compositor: kwin_wayland driver: X: loaded: modesetting dri: iris gpu: xe
resolution: 2880x1800~120Hz
API: EGL v: 1.5 drivers: iris,swrast
platforms: gbm,wayland,x11,surfaceless,device
API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 25.0.6
renderer: Mesa Intel Graphics (LNL)
API: Vulkan v: 1.4.313 drivers: intel,llvmpipe surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor wl: wayland-info x11: xdriinfo,
xdpyinfo, xprop, xrandr
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