root@radxa-zero-3e:~# cat /sys/devices/platform/display-subsystem/drm/card1/card1-HDMI-A-1/modes
3840x2160
3840x2160
3840x2160
1600x900
1280x1024
1280x720
1280x720
root@radxa-zero-3e:~# cat /sys/devices/platform/display-subsystem/graphics/fb0/modes
U:3840x2160p-0
root@radxa-zero-3e:~#