id summary reporter owner description type status component version resolution keywords cc guest host 14102 Kubuntu 15.04 Guest: 3D acceleration broken sac "3d support is unavailable for every KDE5 (Plasma) based Linux distro on Windows Host. Reference https://forums.virtualbox.org/viewtopic.php?f=3&t=67589&p=320394#p320394 https://forums.virtualbox.org/viewtopic.php?f=6&t=64452 If 3D acceleration is enabled, KDEs login screen appears normally, one can login. After logging in, the Desktop appears, everything seems to be normal. BUT: 1.) Right clicking somewhere at the desktop doesn't bring up the context menu 2.) Clicking the ""KDE"" Menu: the KDE Menu appears, but the Control Bar disappears completely 3.) When starting an application in KDE Menu (which can still be opened with Alt+F1), the application seems to start, but no application window appears 4.) Trying to get out of KDE and switch to a console TTY (STRG+ALT+F1) just switches to a smaller screen but in this KDEs background image remains. ==> So the Desktop is completely unusable, it isn't even possible to get a terminal window, so one even can't examine ""glxinfo"" or some logs... It looks like the KDE Background lays in front of everything, similar to an ""z-axis 9999""... After disabling 3D acceleration the Desktops behaves absolutly normal but not with the performance it could have... My System is this: Host: Windows 7 Pro 64Bit Latest VirtualBox 4.3.26, Extension Pack for 4.3.26 installed Guest: Kubuntu 15.04, all current patches installed GuestAdditions from iso shipped with VirtualBox 4.3.26" defect new guest additions/x11/graphics VirtualBox 4.3.26 sancelot Linux Windows