En relançant kwin j'ai ce message d'erreur :
[dominique@host-192-168-1-2 ~]$ kwin
KWin : impossible d'obtenir la sélection du gestionnaire, un autre gestionnaire de fenêtres est il en fonctionnement ? (essayez d'utiliser « --replace »)
Application::crashHandler() called with signal 11; recent crashes: 1
KCrash: Application 'kwin_x11' crashing...
Segmentation fault (core dumped)
[dominique@host-192-168-1-2 ~]$ OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 525M/PCIe/SSE2
OpenGL version string: 4.5.0 NVIDIA 375.39
OpenGL shading language version string: 4.50 NVIDIA
Driver: NVIDIA
Driver version: 375.39
GPU class: GF100
OpenGL version: 4.5
GLSL version: 4.50
Linux kernel version: 4.9
Requires strict binding: no
GLSL shaders: yes
Texture NPOT support: yes
Virtual Machine: no
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-effect.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-script.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-script.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-script.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-script.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
kf5.kcoreaddons.desktopparser: Could not locate service type file kservicetypes5/kwin-script.desktop, tried ("/home/dominique/.local/share", "/usr/share/kde-settings/kde-profile/default/share", "/usr/local/share", "/usr/share")
[dominique@host-192-168-1-2 ~]$ QXcbWindow: Unhandled client message: "_NET_CURRENT_DESKTOP"
QXcbConnection: XCB error: 3 (BadWindow), sequence: 8572, resource id: 102760570, major code: 15 (QueryTree), minor code: 0
QXcbWindow: Unhandled client message: "_NET_CURRENT_DESKTOP"
Il y a eu une mise à jour de kwin aujourd'hui, mais pas d'amélioration.