If anyone could help me, I'm having this issue with my hdmi televisor. It is simple not detectable. I tried switching from gdr3 to lightdm and vice versa, but still not working. In configuration menu, on monitor tab, it is not shown the monitor either, only a few options for my native display.
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Have you looked at the discussion here? https://askubuntu.com/questions/1033785/external-monitor-not-detected-on-ubuntu-18-04 – kwsp Sep 20 '20 at 14:24