SUMMARY The windows contents are blank (only headers are visible) when after restarting the session I use alt-tab or "All windows" effect on restored windows. After I open the restored windows, the problem disappears. STEPS TO REPRODUCE 1. Open multiple windows. 2. Restart Plasma. 3. Use alt-tab or "All windows" OBSERVED RESULT When using alt-tab or "All windows", the restored windows are empty. EXPECTED RESULT Anything except for the void. It is impossible to alt-tab empty windows. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Debian Buster 4.19.0-2 KDE Plasma Version: 5.14.5 KDE Frameworks Version: 5.54.0 Qt Version: 5.11.3 ADDITIONAL INFORMATION The bug isn't critical but such behavior seems a bit inconvenient for alt-tab and All windows users
What exactly is the "All windows" effect?
(In reply to Vlad Zagorodniy from comment #1) > What exactly is the "All windows" effect? Sorry for the misunderstanding. I switched to English. The correct desktop effect name is "Present windows". It's not the problem of the effect because the same issue is present when I use task switching with alt+tab.
Could it be that the windows are shaded?
(In reply to Martin Flöser from comment #3) > Could it be that the windows are shaded? No, they are not rendered at all. It is impossible to take a screenshot while "Present windows" is active, so I took two photos (I will attach it here).
Created attachment 118598 [details] Not rendering windows I powered up Plasma and activated "Present windows", all the windows are blank.
(In reply to Martin Flöser from comment #3) > Could it be that the windows are shaded? Sorry, I didn't understand how the attachment works. There is a photo which when I powered up Plasma and activates "Present windows".
could you please post output of `qdbus org.kde.KWin /KWin supportInformation`?
Here it is: https://gist.github.com/OneAdder/258ef6aa9437422ea6d8e86eb72ddf30
Информационная поддержка KWin: Следующая информация должна быть предоставлена при запросе поддержки,например, на http://forum.kde.org. Она предоставляет сведения о текущем запущенном экземпляре программы, о том, какие опции используются, какой OpenGL драйвер и эффекты запущены. Пожалуйста, размещайте информацию, приведенную ниже , в сервис Pastebin, например, на http://paste.kde.org вместо вставки напрямую в темы форума . ========================== Version ======= KWin version: 5.14.5 Qt Version: 5.11.3 Qt compile version: 5.11.3 XCB compile version: 1.13.1 Operation Mode: X11 only Build Options ============= KWIN_BUILD_DECORATIONS: yes KWIN_BUILD_TABBOX: yes KWIN_BUILD_ACTIVITIES: yes HAVE_DRM: yes HAVE_GBM: yes HAVE_X11_XCB: yes HAVE_EPOXY_GLX: yes HAVE_WAYLAND_EGL: yes X11 === Vendor: The X.Org Foundation Vendor Release: 12003000 Protocol Version/Revision: 11/0 SHAPE: yes; Version: 0x11 RANDR: yes; Version: 0x14 DAMAGE: yes; Version: 0x11 Composite: yes; Version: 0x4 RENDER: yes; Version: 0xb XFIXES: yes; Version: 0x50 SYNC: yes; Version: 0x31 GLX: yes; Version: 0x0 Decoration ========== Plugin: org.kde.breeze Theme: Blur: 0 onAllDesktopsAvailable: true alphaChannelSupported: true closeOnDoubleClickOnMenu: false decorationButtonsLeft: 0, 2 decorationButtonsRight: 6, 3, 4, 5 borderSize: 3 gridUnit: 16 font: Noto Sans,10,-1,5,50,0,0,0,0,0 smallSpacing: 4 largeSpacing: 16 Platform ========== Name: KWin::X11StandalonePlatform Options ======= focusPolicy: 1 nextFocusPrefersMouse: false clickRaise: true autoRaise: true autoRaiseInterval: 750 delayFocusInterval: 300 shadeHover: false shadeHoverInterval: 250 separateScreenFocus: false placement: 4 focusPolicyIsReasonable: true borderSnapZone: 10 windowSnapZone: 10 centerSnapZone: 0 snapOnlyWhenOverlapping: false rollOverDesktops: true focusStealingPreventionLevel: 2 legacyFullscreenSupport: false operationTitlebarDblClick: 5000 operationMaxButtonLeftClick: 5000 operationMaxButtonMiddleClick: 5015 operationMaxButtonRightClick: 5014 commandActiveTitlebar1: 0 commandActiveTitlebar2: 30 commandActiveTitlebar3: 2 commandInactiveTitlebar1: 4 commandInactiveTitlebar2: 30 commandInactiveTitlebar3: 2 commandWindow1: 7 commandWindow2: 8 commandWindow3: 8 commandWindowWheel: 31 commandAll1: 10 commandAll2: 3 commandAll3: 14 keyCmdAllModKey: 16777251 showGeometryTip: false condensedTitle: false electricBorderMaximize: true electricBorderTiling: true electricBorderCornerRatio: 0.25 borderlessMaximizedWindows: false killPingTimeout: 5000 hideUtilityWindowsForInactive: true inactiveTabsSkipTaskbar: false autogroupSimilarWindows: true autogroupInForeground: true compositingMode: 1 useCompositing: true compositingInitialized: true hiddenPreviews: 1 glSmoothScale: 2 xrenderSmoothScale: false maxFpsInterval: 16666666 refreshRate: 0 vBlankTime: 6000000 glStrictBinding: true glStrictBindingFollowsDriver: true glCoreProfile: true glPreferBufferSwap: 101 glPlatformInterface: 1 windowsBlockCompositing: true Screen Edges ============ desktopSwitching: false desktopSwitchingMovingClients: false cursorPushBackDistance: 1x1 timeThreshold: 150 reActivateThreshold: 350 actionTopLeft: 0 actionTop: 0 actionTopRight: 0 actionRight: 0 actionBottomRight: 0 actionBottom: 0 actionBottomLeft: 0 actionLeft: 0 Screens ======= Multi-Head: no Active screen follows mouse: yes Number of Screens: 1 Screen 0: --------- Name: eDP-1 Geometry: 0,0,1920x1080 Scale: 1 Refresh Rate: 60.0079 Compositing =========== Compositing is active Compositing Type: OpenGL OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2) OpenGL version string: 4.5 (Core Profile) Mesa 18.3.4 OpenGL platform interface: GLX OpenGL shading language version string: 4.50 Driver: Intel GPU class: Unknown OpenGL version: 4.5 GLSL version: 4.50 Mesa version: 18.3.4 X server version: 1.20.3 Linux kernel version: 4.19 Direct rendering: Requires strict binding: yes GLSL shaders: yes Texture NPOT support: yes Virtual Machine: no OpenGL 2 Shaders are used Painting blocks for vertical retrace: no Loaded Effects: --------------- zoom kwin4_effect_translucency mousemark kwin4_effect_morphingpopups kwin4_effect_maximize kwin4_effect_logout kwin4_effect_fade kwin4_effect_frozenapp kwin4_effect_login kwin4_effect_dialogparent kwin4_effect_windowaperture slidingpopups slide screenshot minimizeanimation flipswitch desktopgrid cube coverswitch colorpicker presentwindows highlightwindow blur contrast startupfeedback screenedge kscreen Currently Active Effects: ------------------------- blur contrast Effect Settings: ---------------- zoom: zoomFactor: 1.2 mousePointer: 0 mouseTracking: 0 enableFocusTracking: false followFocus: true focusDelay: 350 moveFactor: 20 targetZoom: 1 kwin4_effect_translucency: mousemark: width: 5 color: #8080ff kwin4_effect_morphingpopups: kwin4_effect_maximize: kwin4_effect_logout: kwin4_effect_fade: kwin4_effect_frozenapp: kwin4_effect_login: kwin4_effect_dialogparent: kwin4_effect_windowaperture: slidingpopups: slideInDuration: 150 slideOutDuration: 250 slide: duration: 500 horizontalGap: 45 verticalGap: 20 slideDocks: false slideBackground: true screenshot: minimizeanimation: flipswitch: tabBox: false tabBoxAlternative: false duration: 200 angle: 30 xPosition: 0.33000001311302185 yPosition: 1 windowTitle: true desktopgrid: zoomDuration: 300 border: 10 desktopNameAlignment: 0 layoutMode: 1 customLayoutRows: 2 usePresentWindows: true cube: cubeOpacity: 0.800000011920929 opacityDesktopOnly: false displayDesktopName: true reflection: true rotationDuration: 500 backgroundColor: #000000 capColor: #31363b paintCaps: true closeOnMouseRelease: true zPosition: 100 useForTabBox: false invertKeys: true invertMouse: false capDeformationFactor: 0 useZOrdering: true texturedCaps: false coverswitch: animationDuration: 200 animateSwitch: true animateStart: true animateStop: true reflection: true windowTitle: false zPosition: 807 primaryTabBox: false secondaryTabBox: false colorpicker: presentwindows: layoutMode: 0 showCaptions: true showIcons: true doNotCloseWindows: true ignoreMinimized: false accuracy: 20 fillGaps: true fadeDuration: 150 showPanel: false leftButtonWindow: 1 rightButtonWindow: 2 middleButtonWindow: 5 leftButtonDesktop: 2 middleButtonDesktop: 0 rightButtonDesktop: 3 highlightwindow: blur: contrast: startupfeedback: type: 1 screenedge: kscreen:
I see the same problem on my system. Operating System: Arch Linux KDE Plasma Version: 5.15.4 KDE Frameworks Version: 5.57.0 Qt Version: 5.12.3
Kwin can't render a window until the window renders, the window won't render until the first expose event which doesn't happen for mulitple desktops. This is not an issue on wayland. Marking as fixed by wayland.