SUMMARY Plasma don't show up (panel bar, wallpaper, menu when right clicking on wallpaper, ... but krunner works) when starting on a external screen from a laptop with optimus manager set for Nvidia. STEPS TO REPRODUCE 1. Connect your laptop with HDMI to an external screen and switch (CMD+P) to external screen only 2. Install Optimus Manager, set as Intel for default and after launching your session switch to Nvidia 3. It closes your session, login then again OBSERVED RESULT You will not see your wallpaper, nor your panel until you type "plasmashell --replace" into your krunner EXPECTED RESULT You should not have to type "plasmashell --replace" SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.8.13-arch1-1 (available in About System) KDE Plasma Version: 5.19.5 KDE Frameworks Version: 5.74.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION This bug does not occur when not using an external screen.
Just for information, it is still happening with the 5.21 release.
*** This bug has been marked as a duplicate of bug 391531 ***
*** This bug has been marked as a duplicate of bug 426260 ***