tabbox doesn't show any thumbnails and instead shows output like this: May 07 19:52:34 moria kwin[14344]: areKeySymXsDepressed: any of 2 May 07 19:52:34 moria kwin[14344]: 0 : keySymX=0x "ffe9" i= 8 mask=0x "1" keymap[i]=0x "1" May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: file:///usr/share/kwin/tabbox/thumbnails/contents/ui/main.qml:143:27: Unable to assign [undefined] to QString May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: file:///usr/share/kwin/tabbox/thumbnails/contents/ui/main.qml:143:27: Unable to assign [undefined] to QString May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:34 moria kwin[14344]: No QQuickWindow assigned yet May 07 19:52:36 moria kwin[14344]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 28333, resource id: 19603490, major code: 20 (GetProperty), minor code: 0 So there are 2 issues: 1. For some reason, it is unable to retrieve thumbnails (they work fine in Plasma Workspace/task manager applet) 2. In tabbox/thumbnails/contents/ui/main.qml a check is missing, whether a thumbnails is available before making use of it. Using: - kwin (frameworks based git master, 75cac763) - Qt 5.3.0_beta System information: May 07 20:23:00 moria kwin[14344]: Initializing OpenGL compositing May 07 20:23:00 moria kwin[14344]: Drawable visual (depth 24 ): 0x "8c" May 07 20:23:00 moria kwin[14344]: Drawable visual (depth 32 ): 0x "5e" May 07 20:23:00 moria kwin[14344]: Buffer visual (depth 24 ): 0x "8b" May 07 20:23:00 moria kwin[14344]: OpenGL vendor string: Intel Open Source Technology Center May 07 20:23:00 moria kwin[14344]: OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile May 07 20:23:00 moria kwin[14344]: OpenGL version string: 3.0 Mesa 10.0.4 May 07 20:23:00 moria kwin[14344]: OpenGL shading language version string: 1.30 May 07 20:23:00 moria kwin[14344]: Driver: Intel May 07 20:23:00 moria kwin[14344]: GPU class: IvyBridge May 07 20:23:00 moria kwin[14344]: OpenGL version: 3.0 May 07 20:23:00 moria kwin[14344]: GLSL version: 1.30 May 07 20:23:00 moria kwin[14344]: Mesa version: 10.0.4 May 07 20:23:00 moria kwin[14344]: X server version: 1.15 May 07 20:23:00 moria kwin[14344]: Linux kernel version: 3.14 May 07 20:23:00 moria kwin[14344]: Requires strict binding: no May 07 20:23:00 moria kwin[14344]: GLSL shaders: yes May 07 20:23:00 moria kwin[14344]: Texture NPOT support: yes May 07 20:23:00 moria kwin[14344]: Virtual Machine: no May 07 20:23:00 moria kwin[14344]: Direct rendering: true May 07 20:23:00 moria kwin[14344]: Color correction: false May 07 20:23:00 moria kwin[14344]: OpenGL 2 compositing successfully initialized May 07 20:23:00 moria kwin[14344]: Vertical Refresh rate 60 Hz
can you try using the "Grid" variant. I'm using that and haven't noticed any problems yet. That would help to narrow down whether it's just in the one QML file.
It seems there's something else broken as well. The effect preview shows the selected one, but actually using it just shows "random" different ones, e.g. instead of "Grid" I see "Cover Switch". The previews (e.g. for Grid) won't show any thumbnails as well. Might ping you on IRC for a debug session soon.
Looks like something changed in Qt. If I see it correctly it will affect more than one of the switchers. I'll attach a patch for the thumbnails switcher.
Created attachment 86518 [details] Patch for thumbnails layout
Git commit 2653160c5ab7ed20ac35adb2ab1978b4fb4cee31 by Martin Gräßlin. Committed on 08/05/2014 at 09:15. Pushed by graesslin into branch 'master'. [tabbox/qml] Do not export the item's model data as a variant The hack to get the model data from the currently selected item to the areas outside the list view apparently broke in Qt. Now we have to export the model data elements we actually use. REVIEW: 118047 M +2 -2 tabbox/qml/IconTabBox.qml M +1 -1 tabbox/qml/clients/big_icons/contents/ui/main.qml M +1 -1 tabbox/qml/clients/small_icons/contents/ui/main.qml M +6 -4 tabbox/qml/clients/thumbnails/contents/ui/main.qml M +3 -3 tabbox/qml/desktops/previews/contents/ui/main.qml http://commits.kde.org/kwin/2653160c5ab7ed20ac35adb2ab1978b4fb4cee31