On computers with INTEL video card (Ivy bridge), Ubuntu 12.04.4 (KDE4.8) and 14.04 (KDE4.11.x?) I can see graphical corruption: white stripes, 3D games like HeroesOfNewerth have graphical corruptions too. Sometimes it scramble even cursor of mouse. With Unity these problems do not appear. There are no corruption, even not in games (strange, right?) I tried to downgrade the mesa in 12.04 to MESA 8 and it resolved it. But in Ubuntu 14.04 I cannot do that. Reproducible: Always Steps to Reproduce: 1. Install Ubuntu 12.04.4 or 14.04 2. Install KDE 3. Use KDE and look at white-stripped graphical corruption and in-games graphical corruption. Actual Results: You can see white stripes corruption in KDE and strange rectangular corruption in 3D games. In Unity nothing like this - without graphical glitches, no problems in games. Expected Results: To work like in Unity - without graphical corruption )
please post the output of qdbus org.kde.kwin /KWin supportInformation (you might have to "export QT_SELECT=qt4" to resolve qdbus) different results might stem from various reasons (egl / glx; glsl / gl1.4; ...)
Created attachment 86025 [details] Screenshot of white stripes
ping?
tomas@tomas-Lenovo-Z580:~$ qdbus org.kde.kwin /KWin supportInformation Error: org.freedesktop.DBus.Error.UnknownMethod No such method 'supportInformation' in any interface at object path '/KWin' (signature '') tomas@tomas-Lenovo-Z580:~$ export QT_SELECT=qt4 tomas@tomas-Lenovo-Z580:~$ qdbus org.kde.kwin /KWin supportInformation Error: org.freedesktop.DBus.Error.UnknownMethod No such method 'supportInformation' in any interface at object path '/KWin' (signature '') tomas@tomas-Lenovo-Z580:~$
KDE4.8 is too old for this, please try on Ubuntu 14.04
Greetings! Same problem here on a HP Envy 15-j101sp system running KDE 4.11 on Debian Jessie. Information about video card, as reported by lspci, is: 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) 01:00.0 3D controller: NVIDIA Corporation GK107M [GeForce GT 750M] (rev ff) (Optimus system according to nVidia if I recall correctly.) qdbus org.kde.kwin /KWin supportInformation returns: Version ======= KWin version: 4.11.8 KDE SC version (runtime): 4.11.5 KDE SC version (compile): 4.11.5 Qt Version: 4.8.6 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 showDesktopIsMinimizeAll: false rollOverDesktops: true focusStealingPreventionLevel: 1 legacyFullscreenSupport: false operationTitlebarDblClick: 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 unredirectFullscreen: false glSmoothScale: 2 colorCorrected: false xrenderSmoothScale: false maxFpsInterval: 16666666 refreshRate: 0 vBlankTime: 6000000 glDirect: true glStrictBinding: false glStrictBindingFollowsDriver: true glLegacy: false glCoreProfile: false glPreferBufferSwap: 101 Screen Edges ============ desktopSwitching: false desktopSwitchingMovingClients: false cursorPushBackDistance: 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 Geometry: 0,0,1920x1080 Decoration ========== Current Plugin: kwin3_oxygen Shadows: yes Alpha: yes Announces Alpha: yes Tabbing: yes Frame Overlap: no Blur Behind: no Compositing =========== Qt Graphics System: native Compositing is active Compositing Type: OpenGL OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile OpenGL version string: 3.0 Mesa 10.1.0 OpenGL shading language version string: 1.30 Driver: Intel GPU class: Haswell OpenGL version: 3.0 GLSL version: 1.30 Mesa version: 10.1 X server version: 1.15 Linux kernel version: 3.13 Direct rendering: yes Requires strict binding: no GLSL shaders: yes Texture NPOT support: yes Virtual Machine: no OpenGL 2 Shaders are used Painting blocks for vertical retrace: no Loaded Effects: --------------- kwin4_effect_zoom kwin4_effect_slidingpopups kwin4_effect_login kwin4_effect_coverswitch kwin4_effect_minimizeanimation kwin4_effect_cubeslide kwin4_effect_screenshot kwin4_effect_cube kwin4_effect_desktopgrid kwin4_effect_flipswitch kwin4_effect_translucency kwin4_effect_maximize kwin4_effect_fade kwin4_effect_highlightwindow kwin4_effect_taskbarthumbnail kwin4_effect_dialogparent kwin4_effect_presentwindows kwin4_effect_blur kwin4_effect_logout kwin4_effect_dashboard kwin4_effect_screenedge kwin4_effect_startupfeedback kwin4_effect_kscreen Currently Active Effects: ------------------------- kwin4_effect_blur Effect Settings: ---------------- kwin4_effect_zoom: zoomFactor: 1.2 mousePointer: 0 mouseTracking: 0 enableFocusTracking: false followFocus: true focusDelay: 350 moveFactor: 20 targetZoom: 1 kwin4_effect_slidingpopups: fadeInTime: 250 fadeOutTime: 250 kwin4_effect_login: kwin4_effect_coverswitch: animationDuration: 200 animateSwitch: true animateStart: true animateStop: true reflection: true windowTitle: true zPosition: 900 primaryTabBox: false secondaryTabBox: true kwin4_effect_minimizeanimation: kwin4_effect_cubeslide: rotationDuration: 500 dontSlidePanels: true dontSlideStickyWindows: false usePagerLayout: true useWindowMoving: false kwin4_effect_screenshot: kwin4_effect_cube: cubeOpacity: 0.800000011920929 opacityDesktopOnly: false displayDesktopName: true reflection: true rotationDuration: 500 backgroundColor: #000000 capColor: #d6d2d0 paintCaps: true closeOnMouseRelease: false zPosition: 100 useForTabBox: false invertKeys: false invertMouse: false capDeformationFactor: 0 useZOrdering: false texturedCaps: true kwin4_effect_desktopgrid: zoomDuration: 300 border: 10 desktopNameAlignment: 0 layoutMode: 0 customLayoutRows: 2 usePresentWindows: true kwin4_effect_flipswitch: tabBox: true tabBoxAlternative: false duration: 200 angle: 30 xPosition: 0.330000013113022 yPosition: 1 windowTitle: true kwin4_effect_translucency: kwin4_effect_maximize: kwin4_effect_fade: kwin4_effect_highlightwindow: kwin4_effect_taskbarthumbnail: kwin4_effect_dialogparent: kwin4_effect_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 dragToClose: false kwin4_effect_blur: blurRadius: 12 cacheTexture: true kwin4_effect_logout: useBlur: true kwin4_effect_dashboard: brightness: 0.5 saturation: 0.5 blur: false kwin4_effect_screenedge: kwin4_effect_startupfeedback: kwin4_effect_kscreen: Setting the compositing type to XRender solves the problem, but hurts the performance and some effects (like the cube) that require OpenGL become unavailable.
Please try to - set the compositing backend to GL 1.3 - disable the blur effect - set scaling to "smooth" (not accurate) - run "export KWIN_USE_BUFFER_AGE=0; kwin --replace &"
no feedback on whether the tests from comment #7 improved the situation.
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days, the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please set the bug status as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!