Please try updating that same system:

  sudo apt update
  sudo apt full-upgrade

If the problem returns then we can reopen this bug. Otherwise we'll
consider it fixed.

I expect this was fixed with the introduction of kernel 5.8 recently.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1893568

Title:
  [Dell Inspiron 3793] Screen brightness missing

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