How to reproduce: 1. Run kcmshell5 kcm_sddm 2. For example in a breeze theme choose an image/video file as a background that is located in a directory which has name in Cyrillic. 3. Apply the changes. 4. Check if the changes is applied correctly: sddm-greeter --test --theme /usr/share/sddm/themes/breeze As a result you can see a usual breeze theme with white background. 5. Now choose an image/video file as a background that is located in a directory with Latin symbols. 6. Check again if the changes is applied correctly: sddm-greeter --test --theme /usr/share/sddm/themes/breeze Now you can see that changes applied correctly and you'll see an image as a background of SDDM.
*** This bug has been marked as a duplicate of bug 384294 ***