SUMMARY The kwin_x11 process takes up abnormally high amount of cpu ressources (up to 60% as reported by htop when watching a 720p video on a good system) but the problem seems to fade away when logging out and logging back in. This happens when disabling all the scripts, effects and addons I could find STEPS TO REPRODUCE 1. Boot up the computer OBSERVED RESULT System is sluggish, kwin_x11 uses crazy high amount of cpu EXPECTED RESULT Low (sub 10%) cpu usage. Is achieved after logging out and back in SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.21.5 KDE Frameworks Version: Not sure? Latest from GNU/Arch Linux Qt Version: 5.15.2 ADDITIONAL INFORMATION Please find the output of `qdbus org.kde.KWin /KWin supportInformation` below ``` KWin Support Information: The following information should be used when requesting support on e.g. https://forum.kde.org. It provides information about the currently running instance, which options are used, what OpenGL driver and which effects are running. Please post the information provided underneath this introductory text to a paste bin service like https://paste.kde.org instead of pasting into support threads. ========================== Version ======= KWin version: 5.21.5 Qt Version: 5.15.2 Qt compile version: 5.15.2 XCB compile version: 1.14 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_EGL_STREAMS: yes HAVE_X11_XCB: yes HAVE_EPOXY_GLX: yes HAVE_WAYLAND_EGL: yes X11 === Vendor: The X.Org Foundation Vendor Release: 12011000 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: Plugin recommends border size: None Blur: 0 onAllDesktopsAvailable: true alphaChannelSupported: true closeOnDoubleClickOnMenu: false decorationButtonsLeft: 5, 3, 4, 7 decorationButtonsRight: 0 borderSize: 0 gridUnit: 10 font: IBM Plex Sans,10,-1,5,50,0,0,0,0,0,Regular smallSpacing: 2 largeSpacing: 10 Platform ========== Name: KWin::X11StandalonePlatform Cursor ====== themeName: OpenZone_Black_Slim themeSize: 24 Options ======= focusPolicy: 0 xwaylandCrashPolicy: xwaylandMaxCrashCount: 3 nextFocusPrefersMouse: false clickRaise: true autoRaise: false autoRaiseInterval: 0 delayFocusInterval: 0 shadeHover: false shadeHoverInterval: 250 separateScreenFocus: true placement: 8 focusPolicyIsReasonable: true borderSnapZone: 10 windowSnapZone: 10 centerSnapZone: 0 snapOnlyWhenOverlapping: false rollOverDesktops: true focusStealingPreventionLevel: 1 operationTitlebarDblClick: 5000 operationMaxButtonLeftClick: 5000 operationMaxButtonMiddleClick: 5015 operationMaxButtonRightClick: 5014 commandActiveTitlebar1: 0 commandActiveTitlebar2: 28 commandActiveTitlebar3: 2 commandInactiveTitlebar1: 4 commandInactiveTitlebar2: 28 commandInactiveTitlebar3: 2 commandWindow1: 7 commandWindow2: 8 commandWindow3: 8 commandWindowWheel: 28 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 compositingMode: 1 useCompositing: true hiddenPreviews: 1 glSmoothScale: 1 xrenderSmoothScale: false glStrictBinding: true glStrictBindingFollowsDriver: true glCoreProfile: false glPreferBufferSwap: 101 glPlatformInterface: 1 windowsBlockCompositing: true latencyPolicy: renderTimeEstimator: 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: no Number of Screens: 2 Screen 0: --------- Name: DVI-D-0 Geometry: 1920,0,1920x1080 Scale: 1 Refresh Rate: 59.933 Screen 1: --------- Name: HDMI-0 Geometry: 0,0,1920x1080 Scale: 1 Refresh Rate: 60 Compositing =========== Compositing is active Compositing Type: OpenGL OpenGL vendor string: Mesa/X.org OpenGL renderer string: llvmpipe (LLVM 12.0.0, 256 bits) OpenGL version string: 3.1 Mesa 21.1.2 OpenGL platform interface: GLX OpenGL shading language version string: 1.40 Driver: LLVMpipe GPU class: Unknown OpenGL version: 3.1 GLSL version: 1.40 Mesa version: 21.1.2 X server version: 1.20.11 Linux kernel version: 5.12.9 Direct rendering: Requires strict binding: yes GLSL shaders: yes Texture NPOT support: yes Virtual Machine: no OpenGL 2 Shaders are used Loaded Effects: --------------- screenshot colorpicker highlightwindow startupfeedback kscreen Currently Active Effects: ------------------------- Effect Settings: ---------------- screenshot: colorpicker: highlightwindow: startupfeedback: type: 1 kscreen: Loaded Plugins: --------------- kwin5_plugin_krunner kwin5_plugin_nightcolor Available Plugins: ------------------ kwin5_plugin_colord kwin5_plugin_krunner kwin5_plugin_nightcolor ```
>The kwin_x11 process takes up abnormally high amount of cpu ressources Please include a trace with heaptrack.
Created attachment 139262 [details] heaptrack if high cpu usage kwin_x11 heaptrack of kwin_x11 directly after a reboot, while watching a youtube video (in order to exacerbate the CPU consumption issue)
(In reply to David Edmundson from comment #1) > >The kwin_x11 process takes up abnormally high amount of cpu ressources > > Please include a trace with heaptrack. Thank you for your answer, please find attached the trace in the previous comment
> OpenGL renderer string: llvmpipe (LLVM 12.0.0, 256 bits) You use software rasterizer. This results in much higher CPU usage. Please make sure that you have all necessary drivers installed.
(In reply to Vlad Zahorodnii from comment #4) > > OpenGL renderer string: llvmpipe (LLVM 12.0.0, 256 bits) > > You use software rasterizer. This results in much higher CPU usage. Please > make sure that you have all necessary drivers installed. Oh you're right, (In reply to Vlad Zahorodnii from comment #4) > > OpenGL renderer string: llvmpipe (LLVM 12.0.0, 256 bits) > > You use software rasterizer. This results in much higher CPU usage. Please > make sure that you have all necessary drivers installed. You are right, the renderer is Software Rasterizer after a reboot, and switches back to my graphic card after loging out and back in. I'll try to figure out why this is happening, but if you have some idea please let me know. Thank you for your help though, this narrows the troubleshooting a great deal
Seems like I fixed my issue thanks to this https://bbs.archlinux.org/viewtopic.php?id=249344 I added ``` Section "Files" ModulePath "/usr/lib/nvidia/xorg" ModulePath "/usr/lib/xorg/modules" EndSection ``` to my /etc/X11/xorg.conf and now it works. So it's a nvidia problem and I apologize for reporting it here