I recently installed Ubuntu 22.04. With Ubuntu 20.04, my two monitors merged to create one desktop under KDE. With 22.04, the second monitor displays the KDE boot icon and then goes blank. This happens using Xorg or Wayland. When I boot GNOME under either Xorg or Wayland, the monitors merge as expected. I include Xorg.0.log and xrandr for both KDE and GNOME below.
Xorg.0.log KDEXorg.0.log GNOMExrandr KDExrandr GNOME
Any debugging hints will be gratefully accepted.