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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