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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](https://www.calculatorsoup.com/calculators/technology/ppi-calculator.php?b=1080&a=1920&d=48&units_length=inch&action=solve) 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.
I don't know if I can override it with a local version.
(I had a monitor that lied in its EDID back in the day)