Brightness adjusting does not work on Fedora 33, Dell XPS 15 7590 with OLED display


I have an issue with adjusting brightness level on Dell XPS 15 7590 with OLED display. It does not work either via the graphical interface or when editing /sys/class/backlight/intel_backlight/brightness directly. A similar issue has been reported and solved in the Dell forum, however since the soution is to update Windows version, it is not very helpful. Please advise on how to make it work.

Update: Have made it work following this solution, however it did not work on Wayland - had to switch to XORG first.

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