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                ✅ Solution
          
          
            
            Tag : 
              
                gnome-screensaver  
              
          
          
            
              
                
                Link: 
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            URL: 
              https://askubuntu.com/q/1004713
          
          
            
            Title: 
              No such key “idle-delay” in org.gnome.desktop.screensaver
            
          
          
            ID: 
              /2018/02/10/No-such-key-“idle-delay”-in-org.gnome.desktop.screensaver
            
          
          
            Created: 
               February 10, 2018
          
          
               Edited:  June 12, 2020
          
          
          
            
            Upload: 
              October 19, 2025
          
          
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Use idle-dim instead of idle-delay
You can accomplish your goal through a different setting:
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false