SUMMARY When I try to access the Overview, it doesn't show anything. STEPS TO REPRODUCE 1. Set QT_QUICK_BACKEND=software environment variable in /etc/environment, then restart. 2. Start Plasma (Wayland) or Plasma (X11) session. 3. Hit Meta-W or move the mouse to the top left corner of the screen. OBSERVED RESULT Some flashing, but the overview does not shown. EXPECTED RESULT Overview should be displayed. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Plasma Version: 6.0.1 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2
> Overview should be displayed. The overview and some other effects do not work with software rendering mode intentionally. As it would lead to really really bad performance.
Created attachment 166587 [details] Rendering issue of Overview with QT_QUICK_BACKEND=software The problem is that it enters into the Overview actually, but not rendered. The pointer appears repeatedly on the screen on Wayland until I exit the Overview with Esc or by left click. And the following error messages are shown in the log: kwin_wayland[9636]: QRhi is only compatible with default adaptation kwin_wayland[9636]: QQuickWindow: No render target (neither swapchain nor custom target was provided) If the Overview cannot be supported with software rendering, then probably it would be disabled instead of invisible/broken rendering.
So I think it should be disabled properly rather than displaying an invisible Overview with broken rendering.
Using QT_QUICK_BACKEND=software isn't supported; you're in "There be dragons" territory.
It seems to have been fixed. The overview is now visible with software rendering, except that the thumbnails of the windows are invisible, but it's probably a limitation of the software rendering. Tested with KWin 6.2.4 and Qt 6.8.1.