Created attachment 111128 [details] xrand, lshw, uname, plasmashell data I have laptop Lenovo G710. I Connect 2 fullhd external monitors by hdmi and vga. Now I have strange behaviour on moving any window from one monitor (primary) to second. From some X position window stop showing. Second moment, I have empty space (vertical line) between taskbar and right edge of primary moninor. So, you can see window content at this space. Linux lenovog710 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux plasmashell 5.8.8 Important, I add http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu Also I add link to video:https://yshinkarev.ru/videos/kde_bug_multi_display_20180302_102128.mkv (21MB)
Add link to screnshot: https://yshinkarev.ru/images/kde_bug_multi_display_2018.03.02_10-18-55-Screenshot.png
Please provide output of qdbus org.kde.KWin /KWin supportInformation
method Q_NOREPLY void org.kde.KWin.cascadeDesktop() method int org.kde.KWin.currentDesktop() method Q_NOREPLY void org.kde.KWin.killWindow() method void org.kde.KWin.nextDesktop() method void org.kde.KWin.previousDesktop() method Q_NOREPLY void org.kde.KWin.reconfigure() signal void org.kde.KWin.reloadConfig() method bool org.kde.KWin.setCurrentDesktop(int desktop) method void org.kde.KWin.showDebugConsole() method bool org.kde.KWin.startActivity(QString) method bool org.kde.KWin.stopActivity(QString) method QString org.kde.KWin.supportInformation() method Q_NOREPLY void org.kde.KWin.unclutterDesktop() method QDBusVariant org.freedesktop.DBus.Properties.Get(QString interface_name, QString property_name) method QVariantMap org.freedesktop.DBus.Properties.GetAll(QString interface_name) signal void org.freedesktop.DBus.Properties.PropertiesChanged(QString interface_name, QVariantMap changed_properties, QStringList invalidated_properties) method void org.freedesktop.DBus.Properties.Set(QString interface_name, QString property_name, QDBusVariant value) method QString org.freedesktop.DBus.Introspectable.Introspect() method QString org.freedesktop.DBus.Peer.GetMachineId() method void org.freedesktop.DBus.Peer.Ping()
Please use the complete command. You seemed to have missed the supportInformation
This is bug 370510, no? Fixed since Plasma 5.11.
*** This bug has been marked as a duplicate of bug 370510 ***