onestone

I have just downloaded desktop Armbian 22.08 Jammy XFCE on my Odroid-C2 and it works fine on a 1080p monitor. I need it to work on a different monitor though so I have added the following lines to /boot/armbianEnv.txt display_autodetect=false hdmimode=1680x1050p60hz and added hdmitx=forcergb in the bootargs (which I copy/pasted from /boot/boot.cmd) but it has no effect. My monitor works with these parameters on Hardkernels Ubuntu 18.04 image. What else do I need to do?