Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID Status Resolution Sev Product Comp Assignee Reporter Summary
41794 ASSI --- nor Branch p kde5-pla zerg vercha При смене экрана SDDM постоянно вылезает окно ввода пароля пользователя

File a new bug in the "kde5-plasma-settings" component of the "Branch p10" product