ERR-SYS-00001: Disappearing Windows and Menus with KDE/Plasma Desktop using Intel DDX
<!-- TITLE: ERR-SYS-00001: Disappearing Windows and Menus with KDE/Plasma Desktop using Intel DDX --> <!-- SUBTITLE: Intel X11/XFree86 Driver Issue and an Workaround --> # Summary When using Plasma 5.11.5 and KDE Frameworks 5.41.0 (and earlier) with a Intel X11/XFree86 driver (`xf86-video-intel`), some windows - specifically, those utillising GNOME/GTK+ 3 Client Side Decoration (or VTE 2.90?) - could fail to display on the screen. A taskbar entry of the window could be found, and a window preview should also display correctly. The window is not displaying, neither does it respond to any window management event: no cursor change when moving to the edge of the offending windows. Here are two instances of the issue: - Tilix - GNOME Terminal It is also discovered that the list of word candidates for Fcitx could become invisible. # Possible Cause Not yet identified. # Fixed Version ## System Releases Tarball system releases dated 20180126 or later will no longer include the Intel DDX (`xf86-video-intel`), as we removed `xf86-video-intel` as part of the `x11-base` metapackage. If your system still has this package installed, upon system update, you should be prompted that `xf86-video-intel` is no longer needed - follow the instruction on screen to remove this package automatically. ## Workaround A workaround has been identified - and this issue should only happen on a computer using Intel graphics (GMA, HD, UHD, etc.). To workaround this issue, you should switch to the "Modesetting" X11/XFree86 driver. To switch to this driver, simply add and apply the following configuration file with the instructions below: ## Create a Custom X11 Configuration Using your favourite editor (assuming `nano` here), create a custom X11 configuration file: `sudo nano /etc/X11/xorg.conf.d/20-modesettings.conf` Input in the following content: ``` Section "Device" Identifier "Intel Graphics" Driver "modesetting" Option "AccelMethod" "glamor" Option "DRI" "3" EndSection ``` And finally, `Ctrl-X` then `Y` to save the file. ## Restart Your X11 Session Using the following command: `sudo systemctl restart display-manager`. And you should be switched to the "Modesetting" driver, and that windows should be displaying correctly.