Version: (using KDE 4.2.1) OS: Linux Installed from: Slackware Packages In the desktop Appearance Settings, there should be a configure option to setup showing the wallpaper across all screens. See I have two screens, and now I can only define wallpapers for them separately. In System Settings / Login Manager (KDM's setup) there is already an option on the "Background (3)" page with which I can setup a wallpaper "Across All Screens". I can select this from a dropdown box, under the "Enable background" checkbox. Of course, this only applies to the graphical login screen. So if there is already a function like that in KDE4, why not put it in the user's environment too?
*** This bug has been marked as a duplicate of bug 167558 ***