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.
EDIT: I removed my answer, I thought it was fixed, but the nvidia driver silently failed and “nouveau” was loaded :-(
I uploaded the bug report. I don’t know what to do next… nvidia-bug-report.log.gz (535.7 KB)