I installed a 1650 GTX (Palit KalmX) on an AMD Ryzen 3 machine, running Linux Mint 19.3 with 5.4.0-51-generic kernel. For VGA, when default Xorg-nouveau driver is loaded, there are no display issues. But when I set a Nvidia driver, I get a low resolution and the monitor is “unknown”. I tried all listed drivers, 390, 435, 450 and even not official 455, to no avail.
There might be a hint here: a couple of days ago, I had this resolution issue from time to time. After a number of reboots, it went back to normal. Since yesterday, the issue is permanent (with Nvidia drivers). Maybe there is some problem with a config file, I can imagine.
Secure Boot is disabled.
Does anyone have a clue?