Samsung C27F390: Invalid display and DDC communication failed

[PataviniMa]

I have a Samsung C27F390 connected (via HDMI) to my laptop running Ubuntu 22.04 Jammy. Latest version of ddcutil 2.1.4 installed via ppa. I can't seem to be able to run any core functionality: "detect" returns "Invalid display", and and even a simple "getvcp" call returns "DDC communication failed". One thing to note: I used to run Win10 on this machine with the same exact setup, and I was perfectly able to get/set VCP values with no issues, using tools like ControlMyMonitor. Here is the output of environment and interrogate commands.

Any help would be much appreciated.