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View PC info
Linux Distribution: Ubuntu 20.04 focal
Desktop Environment: Cinnamon 4.4.8
Graphics Card: Nvidia GTX 970
GPU Driver Version: 455.45.01
Have you checked for system updates?:
Yes
I have a 48 inches 1080p TV that is not properly detected.
Ubuntu detect it as 720p 96ppi TV but I confirm that the screen panel has a true 1920x1080p Res with about 46 ppi according to this formula.
how to force the right ppi values on Ubuntu?
https://wiki.archlinux.org/index.php/xrandr#Adding_undetected_resolutions
Later you can add it permanently in a suitable file in the xorg.conf.d dir.
View PC info
I don't know if I can override it with a local version.
You can. There's an X config option specifically to ignore all or part of the EDID provided by your display. Then you can either load in your own EDID file, or just specify the appropriate options. Personally, I favour specifying the HorizSync and VertRefresh ranges and letting everything else happen automatically, rather than a full modeline.
(I had a monitor that lied in its EDID back in the day)