The graphical desktop output feels locked at 60 FPS, even when the screen supports a higher refresh rate. Screen is set to 90, 120 or 144 Hz and only the hardware cursor seems to benefit from that. Using the plasma desktop effect to show the current fps does confirm the lock just above 60 (~62). This results in noticeable stuttering and non smooth output. It might be related to #353038, additional tests to confirm are scrolling, moving windows or open a browser and visit http://testufo.com/#test=photo&photo=quebec.jpg Also, setting V-Sync to "never" seems not to be accepted. This might explain stuttering. I can't observe tearing as long as compositing is enabled. When disabled (alt+shift+f12 or disable on start), tearing is clearly visible. I'm using Arch, but also can confirm the problem exists on Neon. Using xf86-video-ati, -amdgpu or the generic modesetting driver. Also tried en-/disabling TearFree and PageFlip options.
Please provide the output of: qdbus org.kde.KWin /KWin supportInformation
Created attachment 103880 [details] requested KWin support info attached output of `qdbus org.kde.KWin /KWin supportInformation`
Created attachment 103883 [details] kwin support info (60 fps) sorry, the previous output was wrong (fell back to actual 60 Hz on the monitor after unplugging)
Created attachment 103884 [details] kwin support info (120 fps) Found info about MaxFPS and RefreshRate options in kwinrc, set both to 120 and it works. support info also outputs the correct maxFpsInterval (8333333) and refreshRate (120). vBlankTime is still at 6000000, though.
> OpenGL platform interface: EGL EGL is unsupported on X11 and we removed this gui setting some time ago. It could be an explanation why the auto-detection didn't work.
I don't know where this setting came from. But I can confirm the problem exists with an empty/fresh kwinrc. I've tried this before opening the bug here, obviously. Showing 'GLX' then, still locked at 60.
Can you please attach the supportInformation for the glx case?
Created attachment 103900 [details] kwin support info (GLX)
Added support info with untouched kwinrc
Version ======= KWin version: 5.9.0 Qt Version: 5.8.0 Qt compile version: 5.8.0 XCB compile version: 1.12 Operation Mode: X11 only Build Options ============= KWIN_BUILD_DECORATIONS: yes KWIN_BUILD_TABBOX: yes KWIN_BUILD_ACTIVITIES: yes HAVE_INPUT: 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: 11901000 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: false alphaChannelSupported: true closeOnDoubleClickOnMenu: false decorationButtonsLeft: 0, 1, 2 decorationButtonsRight: 6, 3, 4, 5 borderSize: 3 gridUnit: 10 font: Noto Sans,10,-1,5,50,0,0,0,0,0,Regular smallSpacing: 2 largeSpacing: 10 Options ======= focusPolicy: 0 nextFocusPrefersMouse: false clickRaise: true autoRaise: false autoRaiseInterval: 0 delayFocusInterval: 0 shadeHover: false shadeHoverInterval: 250 separateScreenFocus: false placement: 4 focusPolicyIsReasonable: true borderSnapZone: 10 windowSnapZone: 10 centerSnapZone: 0 snapOnlyWhenOverlapping: false rollOverDesktops: true focusStealingPreventionLevel: 1 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: false 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: false 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: no Number of Screens: 1 Screen 0: --------- Name: DP-1 Geometry: 0,0,2560x1440 Refresh Rate: 119.881 Compositing =========== Compositing is active Compositing Type: OpenGL OpenGL vendor string: X.Org OpenGL renderer string: Gallium 0.4 on AMD HAWAII (DRM 2.48.0 / 4.9.7-1-ARCH, LLVM 3.9.1) OpenGL version string: 3.0 Mesa 13.0.4 OpenGL platform interface: GLX OpenGL shading language version string: 1.30 Driver: Unknown GPU class: Unknown OpenGL version: 3.0 GLSL version: 1.30 Mesa version: 13.0.4 X server version: 1.19.1 Linux kernel version: 4.9.7 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 slidingpopups kwin4_effect_login slide screenshot kwin4_effect_windowaperture kwin4_effect_translucency minimizeanimation desktopgrid colorpicker kwin4_effect_morphingpopups kwin4_effect_maximize kwin4_effect_fade presentwindows highlightwindow kwin4_effect_dialogparent 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 slidingpopups: fadeInTime: 150 fadeOutTime: 250 kwin4_effect_login: slide: screenshot: kwin4_effect_windowaperture: kwin4_effect_translucency: minimizeanimation: desktopgrid: zoomDuration: 300 border: 10 desktopNameAlignment: 0 layoutMode: 0 customLayoutRows: 2 usePresentWindows: true colorpicker: kwin4_effect_morphingpopups: kwin4_effect_maximize: kwin4_effect_fade: presentwindows: layoutMode: 0 showCaptions: true showIcons: true doNotCloseWindows: false ignoreMinimized: false accuracy: 20 fillGaps: true fadeDuration: 150 showPanel: false leftButtonWindow: 1 rightButtonWindow: 2 middleButtonWindow: 0 leftButtonDesktop: 2 middleButtonDesktop: 0 rightButtonDesktop: 0 highlightwindow: kwin4_effect_dialogparent: blur: blurRadius: 12 cacheTexture: true contrast: startupfeedback: type: 0 screenedge: kscreen:
A lot of things have changed about compositing scheduling. Please reopen this bug report if the issue is still reproducible.