Screen does not go blank when lid is closed

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I've recently installed Ubuntu 20.04.3 on a new Dell Vostro 3500 (11th gen processor). I was previously using 20.04.2 on an older Inspiron. On my old laptop, when I shut the lid, the screen would automatically go blank. I didn't have to do anything in Settings or Tweaks for this to happen. But in my new laptop, the screen stays on. I've seen a bunch of long threads with the same problem but I haven't been able to find a single solution that works. Settings or Tweaks don't have anything that can control this. I tried editing /etc/systemd/logind.conf and that didn't work either. The only thing that gives an option for this is Dconf Editor. I changed lid-close-ac-action and lid-close-battery-action to 'blank' but it doesn't work. What is overriding this? What do I have to do to ensure the screen goes blank when I shut the lid? I don't want it to lock or suspend, I just want it to go blank. Always assumed this was a very natural and intuitive thing for any laptop regardless of OS, but clearly not.

EDIT: Tweaks seems to be the only tool which can control what closing the lid does, but the only options it offers it whether to suspend on lid close or not, and that does not help me. How do I get Dconf Editor to be the tool that controls this?


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