https://bugs.kde.org/show_bug.cgi?id=509442
Bug ID: 509442
Summary: Windows previews don't work with openGL+egl-wayland2,
also don't work with vulkan backend
Classification: Plasma
Product: plasmashell
Version First 6.4.5
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Task Manager and Icons-Only Task Manager widgets
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
Task Manager / Icons-Only Task Manager - Window previews do not work (they are
a black square) when using the vulkan backend. Additionally, when using
egl-wayland2 instead of the older egl-wayland, previews are broken with all
backends, including openGL. Previews only work when using openGL backend plus
the older egl-wayland. (egl-wayland2 is desired because it fixes an nvidia bug
that distorts the taskbar tooltips, and presumably it will eventually replace
egl-wayland).
STEPS TO REPRODUCE
1. run kcmshell6 kcm_qtquicksettings, switch to vulkan renderer, restart plasma
shell (Alt-F2, kquitapp6 plasmashell; kstart plasmashell)
or....
2. Install egl-wayland 2 from https://github.com/NVIDIA/egl-wayland2, and
reboot after setting the following inside of /etc/environment:
__EGL_EXTERNAL_PLATFORM_CONFIG_FILENAMES=/usr/share/egl/egl_external_platform.d/09_nvidia_wayland2.json:/usr/share/egl/egl_external_platform.d/15_nvidia_gbm.json:/usr/share/egl/egl_external_platform.d/20_nvidia_xcb.json:/usr/share/egl/egl_external_platform.d/20_nvidia_xlib.json
OBSERVED RESULT
No window previews, just a black box where the preview would be.
EXPECTED RESULT
Working window previews.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.16.6-3-cachyos and Plasma on Wayland
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
ADDITIONAL INFORMATION
FYI, Alt-Tab still shows previews in all of these scenarios, even though task
manager previews don't work.
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