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Recently, when connecting an external monitor to my laptop, KDE turned off both displays, which sometimes even endured when disconnecting the monitor. Resetting the display configuration on the command line helped: Before plugging in the video cable, I opened a terminal and typed the following command:

xrandr --auto

After both screens had become black, I pressed Enter and the desktop re-appeared on the laptop screen and I could continue configuring with the regular Display Configuration:

kcmshell4 display

 

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The standard shortcut for killing the X server is (was) Ctrl-Alt-Backspace, but it has been disabled by default in Ubuntu for a while. However, it can easily re-enabled in the KDE system settings (command: systemsettings) under

Input Devices -> Keyboard -> Tab: Advances -> Checkbox: Key sequence to kill the X server

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In KDE, you can toggle display effects (such as transparency, dynamic preview during window tabbing,…) by pressing Alt+Shift+F12. I actually liked mos t effects, but one annoying thing is that Gwenview turns almost completely transparent, making it hard to recognize anything within the window.

I finally found out how to solve this issue:

  1. Start Gwenview
  2. Right-click title bar (or press Alt+F3)
  3. Select More Actions -> Special Application Settings
  4. In the tab Appearance and Fixes, you can configure the Active Opacity to 100% (totally intransparent) or uncheck the entry (both worked for me).

References

  • [1] OpenSUSE guide to KDE – KDE Workspace