Help connecting 1920x1200 monitor via HDMI

I was redirected to the developer forum to ask for help - I hope this is the proper place to do so.

I’m running Ubuntu 20.04 on my Laptop with GTX 1660 Ti and a 1920x1024 display and connect my Samsung Syncmaster 275t plus (native resolution 1920x1200) via HDMI. However, try as I may, I am only able to get it to connect with 1920x1024, but not with the full resolution supported by my monitor.

I tried adding a new configuration via:

xrandr --newmode “1920x1200_60.00” 193.25 1920 2056 2256 2592 1200 1203 1209 1245 -hsync +vsync

and then assigning it to HDMI-0 via:

xrandr --addmode HDMI-0 1920x1200_60.00

but this fails with:

X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 37
Current serial number in output stream: 38

Also trying to follow several instructions on the web to manipulate xorg.conf led nowhere, since no such file was available on my computer. I created and edit one from nvidia-settings, but that seems to be ignored as well.

I cannot believe it is impossible to display 1920x1200 through HDMI on GeForce GTX 1660 Ti. Please advise!

(Linux-x86_64, NVIDIA Driver Version 440.100, Sever Version 11.0)