Having connected with VNC, I try to change the resolution to 1920x1080 via
raspi-config. It confirms that the resolution is set to DMT mode 82 1920x1080, and doesn’t issue any error, however, after a reboot the resolution switches to 1024x768. See screenshot.
I am allowed to obtain a resolution of 1600x1200 (DMT Mode 51).
I am using VNC, no physical display is connected via HDMI.