On the other hand on DEs like LXDE, compositing is not available by default. I too have been seeing compositing shutting off quite a bit, but I figured it had to do with me running Kodi (with compositing shut-off for that app). From the favorites tab in klauncher, open "Configure Desktop", select "Desktop Effects", then uncheck the checkbox that is called "Enable desktop effects at startup". Many apps require compositing for proper working. Docky. Flickering in fullscreen when compositing is enabled. Open System Settings > Workspace Behavior > Desktop Effects and disable individual effects with animations that you don't want. You will still have compositing active. From the same screen, you can define a shortcut to enable/disable compositing anytime. If turning off compositing fixes the micro-stuttering, verify that System Settings -> Hardware -> Display and Monitor -> Compositor -> “Allow applications to block compositing” is enabled. I also tried to shut the machine to sleep mode while running the desktop effects. In System Settings > Display and Monitor > Compositor, uncheck Enable compositor on startup and restart Plasma. This may harm performance. With this setting enabled, most fullscreen games will suspend the compositor … By changing KDE's System Settings. Press Alt + F3 to create a new kwin rule (with the game window selected) #2 Showing 1 - 2 of 2 comments After some time, KDE just disables compositing due to "slow performance". After the upgrade i found that playing some video with mpv disable the kwin compositor. It flickers extremly. And before you ask, no, the "disable compositor for fullscreen windows" is disabled, and this happen with mpv on windowed mode! This command will disable compositing in the kwinrc config file: kwriteconfig --file kwinrc --group Compositing --key Enabled false Then restart kwin (in Alt+F2) with: kwin --replace To get compositing back, just substitute false with true and restart kwin again. To disable your compositor, click “Menu -> Preferences -> Windows.” This will open a new window called “Window Preferences.” Under the General tab, uncheck the box that says “Enable software compositing window manager.” With the compositor disabled, open a terminal and try running Compton. In System Settings > Display and Monitor > Compositor, uncheck Allow applications to block compositing. Disable compositing. eg. If I follow you correctly, you can press Shift-Alt-F12 to turn Kwin compositing back on. Disable compositing permanently or temporarily in the KDE settings, via the assigned hotkey (normally Shift + Alt + F12) or via a script. 2-Add “Allow applications to disable compositing” in settings, and enable it by default.  You should see your rounded corners instantly come back after pressing that key combo. Another issue about KDE 4.5: kdm doesn't save the last logged in user anymore. When the machine wakes up, the rendering looks even more broken. For people like me having issues with this: in KDE you can create a kwin rule to ignore such a thing and force compositing to stay as it was. Screen tearing with NVIDIA Kde 5.6 is giving me some headache. 
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